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Not supported by SBC SWe Lite in this release.

In this section:

 

The Tenor can be used to provide FXS analog capability to the SBC Edge (SBC), allowing for FAX connectivity. In this article, we describe the steps necessary to deploy a Tenor as an analog device in aSBC - Lync SBA topology. The overall configuration comprises three components: the Lync Server, the Tenor, and theSBC:

In this article, G.711 voice codec is used and CNG Tone Detection is disabled:
 
When CNG detection is disabled, theSBC lets the Calling fax machine on either side, ISDN or SIP, to send CNG. However, theSBC is actively listening for and detecting the Fax Answer message that the Answering fax machine sends because Fax pass-thru is enabled.

 

The following diagrams depict the signaling and media flow of the Analog End Point of LYNC in this deployment.

Outbound Fax call flow using Lync call control (signaling and media)

Inbound Fax call flow using Lync call control (signaling and media)

Related Information

In this deployment, following LYNC topology entities, PBX, and numbering plans are used:

 

FQDN
 

 

IP Address
 

 

Description
 

uxdemo.net

134.56.105.30

LYNC SBA Domain

rdc.uxdemo.net

134.56.105.30

DNS/AD/Ent. Root CA

sba247.uxdemo.net

134.56.105.247

FQDN of Lync SBA Pool

ux246.uxdemo.net

134.56.105.246

FQDN of the SBC GW

Tenor AF

134.56.105.41

Analog Device

Nortel Meridian

N/A

ISDN PBX

 

LYNC SBA Users
 

 

Line URI
 

sip:SBAuser1@uxdemo.net

tel:+15102461001

sip:SBAuser2@uxdemo.net

tel:+15102461002

 

LYNC SBA ANALOG Users
 

 

Line URI
 

sip:ae11467d-d09d-4e78-ad2a-e4615b79ac57@Sonus SBC 1000/2000DEMO.Sonus (ANALOGph1)

tel:+15102462001

sip:80274280-9a22-43d9-b194-2640904c3e54@Sonus SBC 1000/2000DEMO.Sonus (ANALOGph2)

tel:+15102462002

sip:3f1e38d7-c8a3-425a-818c-bae3f2c28d62@Sonus SBC 1000/2000DEMO.Sonus (Fax1)

tel:+15102462003

 

Meridian Endpoints
 

 

Extensions
 

PBX Ph1

ext: 6228

PBX Ph2

ext: 6222

Before You Begin

TheSBC SBA must already be configured. If not, configure and deploy the Lync SBA following the instructions in Deploying the SBA (Survivable Branch Appliance).

Lync Configuration

Creating analog End Point using the New-CsAnalogDevice Command

Analog Endpoints must be created from the Lync Management Shell using the New-CsAnalogDevice cmdlet.

  1. On the Lync Server, go to Start > Microsoft Lync Server 2010 > Lync Server Management Shell.
    Enter the command as shown below.

For Aanalog Phone Endpoints:

New-CsAnalogDevice \-LineUri tel:+15102462001 \-DisplayName "Analogph1" \-RegistrarPool cspool.uxdemo.net \-AnalogFax $false \-Gateway ux246.uxdemo.net \-OU "ou=Analog,dc=uxdemo,dc=net"

For Analog FAX Endpoints:

New-CsAnalogDevice \-LineUri tel:+15102462003 \-DisplayName "Fax1" \-RegistrarPool cspool.uxdemo.net \-AnalogFax $true \-Gateway ux246.uxdemo.net \-OU "ou=Analog,dc=uxdemo,dc=net"

(warning) Before running the commands above, make sure that the relevant Organizational Unit(OU) (in this example it is named Analog) exists in Active Directory. On a machine that can access the Active Directory Users and Computers snap-in, launch the Active Directory Users and Computers snap-in and verify that OU is present as shown in below screenshot:

Figure : Verify OU Is Present

 

  • Launch the Lync Management Shell and run the relevant commands to create both Analog Phone and Analog Fax Endpoints as shown in below screenshot:

Figure : Launch Lync Management Shell

 

  • Verify in Active Directory Users and Computers snap-in that relevant users are created successfully in Analog Organizational Unit as shown below:

Figure : Verify Users

 

Explanation of New-CsAnalogDevice

The New-CsAnalogDevice cmdlet instructs Lync to route calls from the analog device to the gateway specified in the -Gateway switch of the cmdlet; thus, ensuring that Fax calls will safely be transmitted over PSTN.

Tenor configuration

Requirements for Tenor

These instructions assume that:

  • The Tenor gateway is running P108-09-10 or newer software release.
  • The Tenor Configuration Manager is CM108-19-00 or newer.

Run the Tenor Wizard

  • Launch the Quintum Configuration Manager and connect to your Tenor Device
  • Upon connecting to the device, Configuration Wizard will run automatically
  • Follow the Wizard Steps and enter the relevant IP addresses, Analog Endpoint numbers..etc. as shown below

Figure : Wizard Steps

 

  • For this exercise we are using DHCP for the Tenor IP address configuration

Figure : IP Address Configuration - DHCP

 

  • Enter the DNS IP address which is used in LYNC SBA Deployment Topology

Figure : IP Address Configuration - DNS

Figure : Enter DNS IP Address

 

  • Verify that IP Address Configuration is completed as shown below

Figure : Verify IP Address Configuration

 

  • Continue the wizard steps for Dial Plan Configuration

Figure : Dial Plan Country

Figure : Progress Tone Country

 

  • Verify that Dial Plan Configuration is completed as shown below

Figure : Verify Dial Plan Configuration

 

  • Continue the wizard steps for Phone Port Configuration

Figure : Phone Port Configuration

 

  • Enter the relevant Phone Number/Extension (in this example we are using 2001 and 2002 users for the Analog phone endpoints)

Figure : Enter Phone Number/Extension - 2001

Figure : Enter Phone Number/Extension - 2002

 

  • Hit on "Save/OK" and then the "Done" buttons

Figure : Add Phone Number/Extension

 

Figure : Configured Phone Number/Extension

 

 

  • Verify that Phone Port Configuration is completed as shown below

Figure : Verify Phone Port Configuration

 

  • Continue the wizard steps for Multi Path Configuration

Figure : Enable Pass Through Calls

Figure : Add Bypass Number

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Figure : Configure Bypass Number

 

  • Verify that Multi Path Configuration is completed as shown below

Figure : Verify Multi Path Configuration

 

 

  • Continue the wizard steps for Line Port Configuration

Figure : Line Port Configuration

 

  • Verify that Line Port Configuration is completed as shown below

Figure : Verify Line Port Configuration

 

  • Continue the wizard steps for VoIP Routing Configuration

Figure : VoIP Routing Configuration

 

  • Enter theSBC 2000 Gateway IP address in the Primary SIP Server IP/Domain Name field and the relevant Port (5060 in this case)

Figure : Enter IP Address

 

 

  • Enter the SIP user information for the related 2001 and 2002 users

Figure : Enter SIP User Information - 2001

Figure : Enter SIP User Information - 2002

Figure : SIP User Configuration

 

  • Verify that VoIP Routing Configuration is completed as shown below

Figure : Verify VoIP Routing Configuration

 

  • Continue the wizard steps for Idle Channel Configuration

Figure : Idle Channel Configuration

 

  • Verify that Idle Channel Configuration is completed as shown below

Figure : Verify Idle Channel Configuration

 

  • Hit on Accept button on Configuration Summary to complete the wizard run

Figure : Complete Wizard Run

 

  • Hit OK to restart the Tenor device as shown below

Figure : Restart Tenor Device

 

Additional Post-wizard Settings and Configuration Verrification

Verifying the SIP Signaling Group Options

  • Reconnect to Tenor Device using the Configuration Manager and Verify that SIP Signaling Group is configured In General Tab as shown below

Figure : Reconnect to Tenor Device

 

  • Verify that SIP Signaling Group is configured in Advanced Tab as shown below

The Transport Type must be set to UDP.

Figure : Verify SIP Signaling Group Is Configured

 

Verify that the Silence Suppression parameter in the IP Routing Group is disabled

Figure : Disable Silence Suppression

 

Verify the Tx/Rx Gain Values in the CAS Signaling Groups

Verify the following settings in Tenor:

CAS Signaling Group

Rx Gain

Tx Gain

CAS Signaling Group - Phone:

-6

0

CAS Signaling Group - Line:

6

0

  • Verify Tx/Rx gain values in the CAS signaling groups - Phone

Figure : CAS Signaling Group - Phone

 

  • Verify Tx/Rx gain values in the CAS signaling groups - Line

Figure : CAS Signaling Group - Line

 

Creating a Route For Calls From Tenor to Lync

  • In Configuration Manager, right click on Number Tables in left pane and select New as shown below

Figure : Create New Number Table

 

 

  • Create a new Number Tables to allow Analog Endpoints to be able to make calls to LYNC endpoints as wells as to PBX endpoints as shown below

Figure : Enter Number Table Information

 

  • Create an entry in the Routing Table as shown below

Figure : Routing Table Entry

 

  • Modify the default Number Table to allow incoming calls to Tenor Device as shown below

Figure : Modify Default Number Table

 

  • Verify that "Use Routing Table" option is selected in Gateway configuration field as shown below

Figure : Select Use Routing Table

 

Verifying Codec Selection

 

Ensure that the codec settings are identical with the matching codec inSBC.
Use only G.711U and/or G.711A.

 

  • Verify that Voice Codec settings are configured correctly as shown below

Figure : Verify Voice Codec - 1

Figure : Verify Voice Codec - 2

 

Verify Supplementary Services Enabled

Tenor supports the following supplementary services - Hold/Unhold, Unattended (Blind) Transfer, and Attended (Consultative) Transfer. These features can be enabled and configured using either a Line Circuit Routing Group (LCRG) or Trunk Circuit Routing Group (TCRG). Follow the configuration steps below:

  • Verify that "Detect Flash Hook Signal" option is selected in CAS Signaling Group-phone > Signaling Tab

Figure : Select Detect Flash Hook Signal

 

  • Verify that "Generate Flash Hook Signal" option is selected in CAS Signaling Group-line > Signaling Tab

Figure : Select Generate Flash Hook Signal

 

  • Verify that Call Services are selected in Line Circuit Routing Group-phone > Call Services Tab

Figure : Select Call Services

 

Change Fax Relay from T.38 without Fallback to G.711

  • Make sure that Fax Relay is set to G.711.

    The codec should be either G.711U or G.711A depending on your particular environment.

  • Enable both, Fax Relay and Fax Modem Coding:
    • Fax Relay: This command configures how the Tenor signals the other end to tell the peer how to switch over to the correct protocol for a fax call. When FaxRelay is set to anything other than 0, there will be a short delay in training as the Tenor determines whether the device at the other end is a fax machine or a modem
    • Fax Modem Coding: Enable the Fax Modem Coding configuration option if the Tenor will be used to make modem calls (remote door/elevator control).
      When the Tenor is configured for modem over IP calls, FaxModemCoding allows you to select which codec will be used.
      When FaxRelay is set to 0 (Disabled), Modem over IP (MoIP) takes over, and all fax calls will be sent as MoIP passthrough with the codec specified by the FaxModemCoding setting.
      When FaxRelay is set to anything other than 0, there will be a short delay in training as the Tenor determines whether the device at the other end is a fax machine or a modem.

Figure : Change Fax Relay

 

Configuring the Relay of Calling Name (CNAM)

The configuration of the Calling Name (CNAM) is optional. Tenor can relay CNAM in both directions Analog to SIP and SIP to Analog.

 

Analog to SIP

SIP to Analog

Not send CNAM

VoIP Configuration > IP Routing Groups > IP Routing Group-default > ANI > Relay Calling Name - Disabled

Circuit Configuration > Signaling Config > CAS Signaling Groups > CAS Signaling Group-phone > Relay Calling name - Disabled

Send the CNAM

Send the CNAM of each analog line as configured in the DN Channel Map:

  1. First add the Calling Name in the channel mapping for each channel.
    VoIP Configuration > DN Channel Map > Calling Name - Free text
  2. Secondly select the global default behavior.
    VoIP Configuration > IP Routing Group > IP Routing Group-default > ANI > Relay Calling name - Relay CNAM in INVITE

Send the CNAM from the SIP call leg.
Circuit Configuration > Signaling Config > CAS Signaling Groups > CAS Signaling Group-phone > Signaling > Relay Calling Name - Relay CNAM

Send default CNAM

Send a default CNAM for all calls regardless of the Calling Name of the originating channel.
VoIP Configuration > IP Routing Group > IP Routing Group-default > ANI > Relay Calling name > Relay Default CNAM > Default Calling Name - Free text

Send a default CNAM for all calls regardless of the Calling Name of the originating channel.
Circuit Configuration > Signaling Config > CAS Signaling Groups > CAS Signaling Group-phone > Signaling > Relay Calling Name > Relay Default CNAM > Default Calling Name - Free text

Sample Tenor AF Configuration File

 Click here to see the Tenor AF DB file Software Version P108-09-10
# /*<-- System Info. Do not overwrite!
# Product: Tenor AF
# IP: 134.56.105.41
# Subnet: 255.255.255.0
# Gateway: 134.56.105.1
# Software: P108-09-10
# Serial Number: A062-208A35
# DB: DB_CMS_M15_A019_V13.0.0_080109
# Updated: WED JUN 22 22:56:23 2011
# -->*/
config
table off
VOIPNetwork 1
SIte 1
TimeServer 1
set UTCOffset 0:00
set PrimaryServerIPAddr 134.56.113.11
set SecondaryServerIPAddr 128.138.140.44
DialPlan 1
set MAXDNlength 30
set MINDNlength 1
set LongDistancePrefix ""
set CarrierPrefixPattern ""
set INTernationaLPrefix[1] ""
set DialPlanCountry 255
UserProgramDialPlan 1
PRIVateNumberingPlan 1
MasterChassis 1
set Type 6
set DBVersion "DB_CMS_M15_A019_V13.0.0_080109"
set SNMPTrapCommunity "trap community"
IVRFileServer 1
SYSLogServer 1
set id "1"
CDRServer 1
set id "1"
CDRServer 2
set id "2"
set CDRServerPort 9003
new ChannelGroup phone
ChannelGroup phone
new ChannelGroup line
ChannelGroup line
NMSServer 1
DNSHosts 1
DNSServer 1
set UseConfiguredDNSServers 1
set PrimaryServerIPAddr 172.16.250.30
set SecondaryServerIPAddr 134.56.112.12
RadiusInfo UserServer
set name "User Authentication Server"
RadiusInfo EndpointServer
set name "Endpoint Authorization Server"
RadiusInfo RoutingServer
set name "External Routing Server"
DOMain 1
set Company "Quintum"
ZOne 1
GateWay 1
set Description "Tenor AF Gateway"
set OutgoingIPRouting 1
set UseRoutingTable 1
VoiceCodec 1
set name ""
set CodecVoiceCoding 9
set CodecPayloadSize 20
set ucVar2 0
VoiceCodec 2
set name ""
set CodecVoiceCoding 8
set CodecPayloadSize 20
set ucVar2 0
CodecProfile default
CASSignalingGroup phone
set id "phone"
set SignalingType 3
set FlashhookSignal 1
set ForwardDisconnectDelay 800
set CallerIDGeneration 1
set RXGain -6
set TXGain 0
CASSignalingGroup line
set id "line"
set ORientation 0
set SignalingType 3
set FlashhookSignal 1
set ForwardDisconnectDelay 500
set CallerIDDetection 1
set RXGain 6
set TXGain 0
SIPSignalingGroup 1
set PrimarySIPServer "172.16.250.246"
set AllowOnlyProxyCalls 0
set SipPstnInterworking 1
set UserAgentHeader "Quintum/1.0.0"
change 1 lp 5060
add 5061 ua 102 pu 2001 ppw 2001 c[1] 2001
add 5062 ua 103 pu 2002 ppw 2002 c[1] 2002
H323SignalingGroup 1
TrunkCircuitRoutingGroup line
set id "line"
set EndOfDialDigit #
LineCircuitRoutingGroup phone
set id "phone"
set EndOfDialDigit #
set CallWaiting 1
set HolD 1
set UnattendedTRansfer 1
set AttendedTRansfer 1
FaxProfile 1
set FaxNominalDelay 200
IPRoutingGroup default
set EndOfDialDigit #
set MediaQOSValue b0
set SignalingQOSValue b0
ToneProfile 1
set id "1"
DNChannelMap 1
add 2001 ua 102
add 2002 ch 2 ua 103
NumberTable default
set id "default"
add 2001 op 2001
add 2002 op 2002
new NumberTable ToSBC
NumberTable ToSBC
set id "ToSBC"
add 1* op 1*
add 2* op 2*
add 6* op 6*
RoutingTable 1
add LCRG-phone ot UA-101 cdnt NT-ToSBC dmc cd
GateKeeperParam 1
EndPointAddressDirectory 1
QOSPolicy 1
RouteDirectory 1
StaticRoute 1
set id "1"
table on

ChannelGroup phone
set SignalingGroupAttached CASSignalingGroup-phone
set RoutingGroupAttached LineCircuitRoutingGroup-phone
ChannelGroup line
set SignalingGroupAttached CASSignalingGroup-line
set RoutingGroupAttached TrunkCircuitRoutingGroup-line
CodecProfile default
set VoiceCodecAttached[1] VoiceCodec-1
set VoiceCodecAttached[2] VoiceCodec-2
TrunkCircuitRoutingGroup line
LineCircuitRoutingGroup phone
IPRoutingGroup default
set CodecProfileAttached CodecProfile-default
StaticRoute 1
set IPRoutingGroupAttached IPRoutingGroup-default
# DO NOT TOUCH: Integrity Checked!
 Click here to see the Tenor AF DB file Software Version P107-09-10
# /*<-- System Info. Do not overwrite!
# Product: Tenor AF
# IP: 10.0.0.164
# Subnet: 255.255.255.0
# Gateway: 10.0.0.1
# Software: P107-09-10
# Serial Number: A062-999999
# DB: DB_CMS_M14_A018_V12.0.0_121107
# Updated: SAT JUN 25 20:32:46 2011
# -->*/
config
table off
VOIPNetwork 1
SIte 1
TimeServer 1
set UTCOffset 0:00
set PrimaryServerIPAddr 10.0.0.10
set SecondaryServerIPAddr 10.0.2.10
DialPlan 1
set MAXDNlength 30
set MINDNlength 1
set LongDistancePrefix ""
set CarrierPrefixPattern ""
set INTernationaLPrefix[1] ""
set DialPlanCountry 255
set ProgressToneCountry 6
UserProgramDialPlan 1
IPDialPlan default
PRIVateNumberingPlan 1
MasterChassis 1
set Type 6
set DBVersion "DB_CMS_M14_A018_V12.0.0_121107"
set SNMPTrapCommunity "trap community"
IVRFileServer 1
SYSLogServer 1
set id "1"
CDRServer 1
set id "1"
CDRServer 2
set id "2"
set CDRServerPort 9003
new ChannelGroup phone
ChannelGroup phone
NMSServer 1
DNSHosts 1
DNSServer 1
set PrimaryServerIPAddr 10.0.0.10
set SecondaryServerIPAddr 10.0.2.10
RadiusInfo UserServer
set name "User Authentication Server"
RadiusInfo EndpointServer
set name "Endpoint Authorization Server"
RadiusInfo RoutingServer
set name "External Routing Server"
DOMain 1
set Company "Quintum"
ZOne 1
GateWay 1
set Description "Tenor AF Gateway"
set OutgoingIPRouting 1
NumberDirectories 1
BypassNumberDirectory 1
set id "1"
HuntLDNDirectory pub1
set id "pub1"
HuntLDNDirectory prv1
set id "prv1"
set LDNType 1
CallerIDXlationDirectory 1
set id "1"
InboundDNISXlationDirectory 1
set id "1"
HopoffNumberDirectory 1
set id "1"
VoiceCodec 1
set name "G711A"
set CodecVoiceCoding 8
set CodecPayloadSize 20
set ucVar2 0
VoiceCodec 2
set name "G711U"
set CodecVoiceCoding 9
set CodecPayloadSize 20
set ucVar2 0
CodecProfile default
CASSignalingGroup phone
set id "phone"
set SignalingType 3
set ForwardDisconnectDelay 800
set CallerIDGeneration 1
set RXGain -6
set TXGain 0
CASSignalingGroup line
set id "line"
set ORientation 0
set ForwardDisconnectDelay 500
set RXGain 6
set TXGain 0
SIPSignalingGroup 1
set PrimarySIPServer "172.23.197.30"
set AllowOnlyProxyCalls 0
set UserAgentHeader "Quintum/1.0.0"
change 1 lp 5060 pu 200829 ppw 200829 c[1] 200829
add 5061 ua 102 pu 200827 ppw 200827 c[1] 200827
H323SignalingGroup 1
TrunkCircuitRoutingGroup line
set id "line"
set EndOfDialDigit #
LineCircuitRoutingGroup phone
set id "phone"
set EndOfDialDigit #
set ModemBypass 1
FaxProfile 1
set FaxNominalDelay 200
IPRoutingGroup default
set EndOfDialDigit #
set MediaQOSValue b0
set FaxRelay 3
set SignalingQOSValue b0
ToneProfile 1
set id "1"
DNChannelMap 1
add 200829 ua 101
add 200827 ch 2 ua 102
GateKeeperParam 1
EndPointAddressDirectory 1
QOSPolicy 1
RouteDirectory 1
StaticRoute 1
set id "1"
table on

ChannelGroup phone
set SignalingGroupAttached CASSignalingGroup-phone
set RoutingGroupAttached LineCircuitRoutingGroup-phone
CodecProfile default
set VoiceCodecAttached[1] VoiceCodec-1
set VoiceCodecAttached[2] VoiceCodec-2
TrunkCircuitRoutingGroup line
set HopoffNumberDirAttached[1] HopoffNumberDirectory-1
LineCircuitRoutingGroup phone
set BypassNumberDirAttached[1] BypassNumberDirectory-1
set PUBHuntLdnDirAttached[1] HuntLDNDirectory-pub1
set PRIVHuntLdnDirAttached[1] HuntLDNDirectory-prv1
IPRoutingGroup default
set CodecProfileAttached CodecProfile-default
set IPDialPlanAttached IPDialPlan-default
StaticRoute 1
set IPRoutingGroupAttached IPRoutingGroup-default
# DO NOT TOUCH: Integrity Checked!

Sonus SBC 1000/2000 configuration

Requirements and Prerequisites

  • This document assumes thatSBC Lync 2010 wizard was ran prior to the configuration
  • Running the Lync 2010 wizard will ensure SRTP towards Lync is set to Required
  • Media bypass must be enabled in Lync

SIP Registrar Table

  • Browse toSBC 2000 WebUI > Settings Tab > SIP / Local Registrars (in left pane)
  • Click on Add (plus) button and add a SIP Local Registrar Entry as shown below

Figure : Add SIP Local Registrar Entry

 

 

Media List Configuration

  • Browse toSBC 2000 WebUI > Settings Tab > Media List (in left pane)
  • Click on Add (plus) button and add a Media List Entry as shown below

Make sure to have following settings are configured in Tenor Media List:

CNG

Disabled

Fax passthru

Enabled

Modem Passthru

Enabled

Silence Suppression

Enabled

Rx/Tx Gain

0

Figure : Add Media List

 

Translation Table

  • Browse toSBC 2000 WebUI > Settings Tab > Translation (in left pane)
  • Click on Add (plus) button and add a Translation Table with following entry as shown below

Figure : Add Translation Table

 

Signaling Group (uses UDP only)

  • Browse toSBC 2000 WebUI > Settings Tab > Signaling Groups (in left pane)
  • Click on Add SIP SG button and add a SIP Signaling Group for Tenor Device connectivity as shown below

Figure : Add SIP Signaling Group

 

Call Routing Table

  • Browse toSBC 2000 WebUI > Settings Tab > Call Routing Table (in left pane)
  • Click on SIP to ISDN Call Route Table and hit Add (plus) button to add an entry to route calls to Tenor (for those with 2xxx extension in this example)

Figure : Add Entry to Route Calls

 

  • Re-sequence the Call Route entries in this table to make sure that calls to 2xxx extensions (Analog Endpoints) will use the entry that you just created in previous step

Figure : Re-sequence Call Route Entry

 

Troubleshooting Techniques

Troubleshooting FAX Calls Between the Tenor and PSTN

  • If you are getting comm errors on the Fax machine, check the following resources for solutions:
  • If faxes are failing, check the E1 port counters for slips and frame errors.

     Click here to see a screenshot of a *bad* E1 line

    Figure : Screenshot of E1 Line

     

     

  • The frame errors and the slips counters must notbe increasing. You can check if they are increasing by resetting the counters. If the errors are increasing, the issue could be caused by one of the following:
    • System timing / clocking. Check the clock source (System -> System Timing) - it should be set to Network/T1/E1 port and not System/Free run. If the clock source is set to Network, but the Current Active Clock shows as Free run, click Apply and ensure that Current Active Clock is now set to Primary. This should resolve the clocking issue as long as the error counters do not increase.
    • If the Tenor is not configured to register with theSBC local SIP registrar and the SIP Signaling group inSBC constantly goes down, check the contents of the var_config.cfg file (from Tenor Config Manager -> Tools -> Var_config -> Edit) and delete the line specifying the transport protocol as in P108 it is obsolete.
    • Bad E1 cable. Replace the cable.
    • Faulty RJ45 jacks. Replace the cable or fix the Rj45 jacks.
    • Faulty RJ45 socket. Try configuring a different T1/E1 port. Visually check the pins in the E1/T1 ports for any differences.