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The global servers object allows you to configure ENUM and E911 servers as well as DNS global settings. The 'servers' object includes global configurations for DNS servers used for SIP NAPTR, SRV, and A-record lookups.

When the ERE receives multiple records with the same order value and preference for a NAPTR query, the ERE considers only the first record received to resolve the route. If it does not find a route for the chosen record, it returns a 'no route found' response, and will not consider other records to resolve the route.

However, in the case where the order value and preference are different for the received records, the record chosen to resolve the route is based on the RFC rule. In this scenario, if the ERE/PSX does not find the route for the chosen record, it returns a 'no route found' response, and will not consider other records to resolve the route. 

The ENUM server returns a NAPTR response with an IP address to the SBC. To route a call to the IP Peer associated with this IP address, ensure the following is provisioned in ERE.

  1. Configure a SIP Domain with the IP address of the IP Peer.
  2. Create an IP Peer using the IP address above, and associate this IP peer to a routing label.
  3. Configure a Username Routing entry using SIP Domain from step 1, and attach the routing label created in step 2.

The SBC supports load balancing across ENUM servers for individual ENUM zones using enumDomainName, lwresdProfile and enumDomainNameLabel parameters described in this section. ENUM client routes the query to ENUM servers based on the load balancing scheme configured for that zone. ENUM client uses the following load balancing schemes to route the requests to ENUM servers. For details, refer to ENUM Support.

  • Sequential
  • Round Robin
  • Proportional

Note

Before deleting a DNS group, first delete the DNS local record names and DNS server in that group. 

Global DNS Servers

Command Syntax

% set global servers 
	dns global
		ednsFailureCount <1-5>
		ednsPayloadSize <512-4096 bytes>
		ednsRetryAfter <60-180 seconds>
		iterationCount <0-32>   
		monitoringInterval <0-300> 
		probeInterval <0-300> 
		retransmissionCount <0-20> 
		retransmissionTimer <100-10000>
		timeouts <0-32>
	e911 
		<e911_service_name>
		criteria triggerCriteria <criteria>
		defaultTreatment <applyFinalTreatment | routeAsDialed>
		flags active <disable | enable>
		requestTimeOut <0-2147483647>
		routePrecedence <local | lro>
	e911VpcDevice <device_name>
		deviceData <0-32767>
			ipAddress <ip_address>
			portNumber <0-65535>
	enumDomainName <domain_name>
		forwardersData <0-99999>
			forwarderDescription <description>
			forwarderIP <IPv4 or IPv6 address>
		loadDistribution <proportion | roundRobin | sequence> 
		queryRetryTimer <0-10000 ms>
		zoneType individual
	enumDomainNameLabel DEFAULT_ZONE_LABEL enumDomainNameId <enumDomainName's name>
	lwresdProfile <profile name>

Command Parameters

 

Table : Global DNS Servers Parameters

Parameter

Length/Range

Description

dns global

N/A

Use this object to configure global DNS settings. Parameters:

  • ednsFailureCount – The maximum number of EDNS failure responses allowed, after which the DNS server is identified as unsupported for EDNS. (range: 1-5 / default = 3)
  • ednsPayloadSize – Specifies the global EDNS payload size, in bytes, for DNS Servers. (range: 512-4096 / default = 1280
  • ednsRetryAfter – Specifies the number of seconds to wait before retrying to establish EDNS support after a failure. (range: 60-180 / default = 180>
  • iterationCount – Global Iteration count limit for DNS iterations of server requests. (range: 0-32 / default = 8).
  • monitoringInterval – Global monitoring interval (in seconds) for DNS Servers. (range: 0-300 / default = 5).
  • probeInterval – Global probe interval (in seconds) for blacklisted DNS Servers. (range: 0-300 / default = 5).
  • retransmissionCount –  Global retransmission count limit for DNS iterations of server requests.  (range: 0-20 / default = 2).
  • retransmissionTimer –  Global retransmission timer value (in milliseconds) for DNS iterations of server requests. (range: 100-10000 / default = 500)
  • timeouts – Global number of time outs for blacklisting a DNS Server. (range: 0-32 / default = 0).

INFO:

Use the following command to enable EDNS support:

% set addressContext <addressContext Name> dnsGroup <dnsGroup Name> ednsSupport enabled

e911

N/A

Use this parameter to configure enhanced 911 service.

  • <e911_service_name>
  • criteria triggerCriteria <criteria>
  • defaultTreatment– Default treatment to apply for requests that time out.
    • applyFinalTreatment
    • routeAsDialed (default)
  • flags active
    • disable (default)
    • enable
  • requestTimeOut – (range: 0-2147483647 / default = 4000)
  • routePrecedence– Routing treatment to apply in the event that a location for the caller cannot be determined, either “Local” or “Last Routing Option” (LRO).
    • local
    • lro (default)

e911VpcDevice

N/A

Use this object to configure the IP address and port number of the E911 VoIP Positioning Center (VPC) device. This parameter is used  for queries to one or more E911 VPCs for the Emergency Services Routing Number of the Public Services Answering Point nearest the current location of the caller.

  • deviceData <call priority: 0-32767>
    • ipAddress <IPv4 or IPv6 address>
    • portNumber <0-65535>
enumDomainName 1-63 characters

<domain_name> – Name of the ENUM domain containing forwarderIP entries for load balancing.

  • forwardersData <priority #> – Priority or sequence number of each forwarderIP defined below. A lower value represents a higher priority. This value is unique for each forwarderIP. (range: 0-99999).
    • forwarderDescription <description> – Textual description of each fowarderIP entry.
    • forwarderIP <IPv4 or IPv6 address> – ENUM server IPv4 or IPv6 address of this forwarderIP entry.
  • loadDistribution  – Load distribution strategy. Refer to ENUM Support for details.
    • proportion
      • percentageDistribution – The percentage of load distribution to calculate for each IP in enumDomainName (range: 0-99999).
    • roundRobin
    • sequence (default)
  • queryRetryTimer – The time, in milliseconds, that SLWRESD process waits before trying the next IP in the forwardersData list (range: 0-10000 | default = 4000).
  • zoneType individual – The zone type for this ENUM domain (At present, "individual" is the only zone type available, and it indicates SBC supports load balancing across individual zones).

NOTE: All forwarderIP entries for this enumDomainName must be configured with the same loadDistribution type and queryRetryTimer value because attributes apply to ENUM domain, not individual forwarderIP entries.

INFO: Refer to ENUM Support for additional feature details and descriptions.

enumDomainNameLabelN/A

<ENUM domain name label> – A collection of ENUM domains used by SLWRESD process for performing ENUM queries. The default enumDomainNameLabel value is "DEFAULT_ZONE_LABEL".

  • enumDomainNameId <enumDomainName's name> – The enumDomainName of each ENUM domain to attach to this enumDomainNameLabel.

enumService

N/A

Use this object to configure ENUM service. See Global ENUM Service Parameters table below for parameter details.

lwresdProfileN/A

<profile name> – Profile name used by the SLWRESD process. The default profile name is "DEFAULT". The SLWRESD process uses the ENUM zones configured for performing an ENUM query against enumDomainLabel.

See LWRESD Profile Parameters table below for parameter details.

 

LWRESD Profile

Command Syntax

% set global servers lwresdProfile <profile name>
	description <description>
	enableLwresdLog <disable | enable>
	enumDomainNameLabel <ENUM domain name label>

Command Parameters

Table : LWRESD Profile Parameters

Parameter

Length/Range

Description

lwresdProfile1-23 characters

<profile name> – Profile name used by the SLWRESD process. The default profile name is "DEFAULT". The SLWRESD process uses the ENUM zones configured for performing an ENUM query against enumDomainLabel.

NOTE: Only one lwresdProfile is allowed.

description1-255 characters

<description> – Textual description of lwresdProfile

enableLwresdLogN/AUse this flag to enable/disable LWRESD log.
  • disable (default)
  • enable
enumDomainNameLabelN/A

The ENUM domain name label created for enumDomainNameLabel entity. Use this parameter to associate the lwresdProfile with a particular enumDomainNameLabel.

Global ENUM Service

To support ENUM services for SBC in ERE mode, manually create an ACL rule towards ENUM server to allow the packets (ENUM responses) from ENUM server into SBC. See the CLI example below.

Note

Set fillRate to a higher value (for example, fillRate = 2000) to support high ENUM call loads (more than 20 cps). Refer to IP Access Control List - CLI for configuration details.

Example ACL Rule
% set addressContext default ipAccessControlList rule ENUMSEV precedence 1 protocol any sourceIpAddress <ENUM_SERVER_ADDRESS> sourceAddressPrefixLength 32 action accept fillRate 50 bucketSize 50 state enabled 

Command Syntax

% set global servers enumService <name>
	criteria triggerCriteria <criteria>
	defaultTreatment <applyFinalTreatment | routeAsDialed>
	enumDefinitions privateDomainNameForEnumLookups <private_domain_name>
	flags
		active <disable | enable>
		processCallingNumber <disable | enable>
		processNewANI <disable | enable>
	priority <129-140>
	requestTimeOut <0-2147483647>
	serviceType <cnam | lnp | sipAor>

 

Command Parameters

Table : Global ENUM Service Parameters

Parameter

Length/Range

Description

<service_name>1-23ENUM Service name.
criteria1-23triggerCriteria <criteria> – Trigger criteria to use for this ENUM Service. The characters #%^&(){}<>,/\;`[]=!$"*?|~ and SPACE are not allowed.
defaultTreatmentN/A

Default treatment to apply to this ENUM Service.

  • applyFinalTreatment
  • routeAsDialed (default)
enumDefinitions 

Use this parameter to specify how to treat ENUM definitions.

  • privateDomainNameForEnumLookups <private_domain_name> – Specify the private domain name to use for ENUM look-ups.
 flags  
  • active
    • disable (default)
    • enable
  • processCallingNumberEnable this flag to analyze the calling number using prefix profile. When this flag is disabled, the calling number is not analyzed and hence if it has +CC, the same is sent as-is to SBC in the calling number field in policy response.
    • disable (default)
    • enable
  • processNewANI When this flag is enabled for ENUM AoR service, and ENUM AoR response contains "newani=<some_number>" parameter in NAPTR record, the ERE overwrites the existing calling number of the call with the newANI number. When this flag is disabled, any newANIparameters received in NAPTR response are ignored in PES.
    • disable (default)
    • enable
priority129-140

Specifies the priority (order) of ENUM service execution. If this parameter is not set or set to the default of '129', default priorities are assigned for LNP (130), CNAM (131) and SIP AoR (132). If a different order of service execution is desired, set the priorities accordingly.

For example, setting CNAM priority to 133 executes SIP AoR before CNAM.

requestTimeOut0-2147483647Request timeout value, in milliseconds. (default = 2000)
serviceTypeN/A

Use this parameter to specify the ENUM service type. Options are:

  • cnam
  • lnp
  • sipAor

 

Command Examples

To configure E911 server, execute the following CLI commands:

% set global country 1 listOfNumberOfDigitsToMatch criteria 10,6,3,0  
% commit 
% set profiles digitParameterHandling numberTranslationCriteria DEFAULT_E911 none Sonus_NULL Sonus_NULL 4451211022 1 lookupType e911 
% set global servers e911 DEFAULT_E911 flags active enable 
% set global servers e911VpcDevice DEFAULT_E911 deviceData 0 ipAddress 10.6.30.137 portNumber 9000 
% set global servers e911 DEFAULT_E911 vpcDevice DEFAULT_E911 
% set global servers e911 DEFAULT_E911 criteria triggerCriteria DEFAULT_E911

 

To configure global ENUM service, execute the following CLI commands:

  1. Configure numberTranslationCriteria for calledUri as below

    % set profiles digitParameterHandling numberTranslationCriteria ENUM_CR calledUri ims.comcast.com Sonus_NULL 9876543210 1 lookupType enumCnam 



  2. Provision enumService:

    % set global servers enumService ENUMSER1 criteria triggerCriteria ENUM_CR 
    % set global servers enumService ENUMSER1 serviceType cnam flags active enable 



  3. Configure the private domain 'ims.comcast.com' for ENUM service.

    % set global servers enumService ENUMSER1 enumDefinitions privateDomainNameForEnumLookups ims.comcast.com  

 

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