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IMPORTANT

The Transparency Profile is the recommended method of configuring transparency on the SBC Core for new deployments as well as when applying additional transparency configurations to existing deployments. Do not use IP Signaling Profile flags in these scenarios because the flags will be retired in upcoming releases.

Refer to the SBC SIP Transparency Implementation Guide for additional information.

Signaling

Transparency Profile at the egress Trunk Group (TG_AS)

A transparency profile with “all” header is configured and associated with SIP trunk group TG_AS.

Configuration details:

% set profiles services transparencyProfile TP_AS sipHeader all
% set profiles services transparencyProfile TP_AS state enabled
% commit

% set addressContext AC1 zone ZONE_AS sipTrunkGroup TG_AS services transparencyProfile TP_AS
% commit

The  following  IPSP  flag “disableHostTranslation” has to be enabled to ensure that the host part of Request-URI, To, From headers is not replaced by SBC.

% set profiles signaling ipSignalingProfile DEFAULT_SIP commonIpAttributes flags disableHostTranslation enable
Incoming INVITE:

INVITE sip:7945422980@10.54.20.53:5060 SIP/2.0

Via:SIP/2.0/UDP 10.54.80.101:6865

Route: <sip:7945422980@10.54.20.53:5060;lr>

Max-Forwards: 70

From:+819012340001 <sip:+819012340001@10.54.80.101:6865>;tag=28293

To:<sip:7945422980@10.54.20.53:5060>

Call-ID:141415227868652203_1034102675@10.54.80.101

CSeq:6924 INVITE

Contact: <sip:10.54.80.101:6865>

Allow: OPTIONS, INVITE, CANCEL, ACK, BYE, INFO, PRACK, UPDATE

Accept: application/sdp; level=1, application/x-private, text/html

Alert-Info: <http://www.sonus-testing.com/sounds/moo.wav>

Call-Info: <http://wwww.example.com/alice/photo.jpg>;purpose=icon

Session-Expires: 1800

Content-Type: application/sdp

Content-Length: 284

 

 

Outgoing INVITE:

INVITE sip:7945422980@10.54.20.53:5060 SIP/2.0

Via: SIP/2.0/UDP 10.54.21.53:5060;branch=z9hG4bK04B00006d290dab7bde

Via:SIP/2.0/UDP 10.54.80.101:6865

From: "+819012340001" <sip:+819012340001@10.54.80.101>;tag=gK04000184

To: <sip:7945422980@10.54.20.53>

Call-ID: 262144_41283677@10.54.21.53

CSeq: 55481280 INVITE

Max-Forwards: 69

Allow: INVITE,ACK,CANCEL,BYE,REGISTER,REFER,INFO,SUBSCRIBE,NOTIFY,PRACK,UPDATE,OPTIONS,MESSAGE,PUBLISH

Route:<sip:7945422980@10.54.20.53:5060;lr>

Contact: <sip:10.54.80.101:6865>

Record-Route: <sip:10.54.21.53:5060;lr>

Accept: application/sdp; level=1, application/x-private, text/html

Alert-Info: <http://www.sonus-testing.com/sounds/moo.wav>

Call-Info:  <http://wwww.example.com/alice/photo.jpg>;purpose=icon

Session-Expires: 1800

Supported: timer,100rel,precondition,replaces

Session-Expires: 1800

Min-SE: 90

Content-Length:   187

Content-Disposition: session; handling=required

Content-Type: application/sdp

Points to Note:

Max-Forwards header is not transparently passed. It is decremented by 1.

Allow header is modified by SBC. It is not transparently sent.

 

Transparency Profile at the ingress Trunk Group (TG_IAD)

A transparency profile with “all” header is configured and associated with SIP trunk group TG_IAD.

An unknown header named “Sherlock” should not be passed in this scenario.

Configuration details:

% set profiles services transparencyProfile TP_IAD sipHeader all
% set profiles services transparencyProfile TP_IAD sipHeader sherlock ignoreTransparency yes
% set profiles services transparencyProfile TP_IAD state enabled
% commit

% set addressContext AC1 zone zone1 sipTrunkGroup TG_IAD services transparencyProfile TP_IAD
% commit
Incoming 200 OK:

SIP/2.0 200 Ok

Via: SIP/2.0/UDP 10.54.21.53:5060;branch=z9hG4bK04B00006d290dab7bde,SIP/2.0/UDP 10.54.80.101:6865

From: "+819012340001" <sip:+819012340001@10.54.80.101>;tag=gK04000184

To: <sip:7945422980@10.54.20.53>;tag=41777

Call-ID: 262144_41283677@10.54.21.53

Contact: <sip:9786148000@10.54.80.110:8865>

CSeq: 55481280 INVITE

Sherlock: Elementary, my dear Watson

Content-Type: application/sdp

 

 

Outgoing 200 OK:

SIP/2.0 200 OK

Via:SIP/2.0/UDP 10.54.80.101:6865

From:+819012340001 <sip:+819012340001@10.54.80.101:6865>;tag=28293

To:<sip:7945422980@10.54.20.53:5060>;tag=gK048000b7

Call-ID: 141415227868652203_1034102675@10.54.80.101

CSeq: 6924 INVITE

Accept: application/sdp, application/isup, application/dtmf, application/dtmf-relay,  multipart/mixed

Contact: <sip:7945422980@10.54.20.53:5060>

Allow: INVITE,ACK,CANCEL,BYE,REGISTER,REFER,INFO,SUBSCRIBE,NOTIFY,PRACK,UPDATE,OPTIONS,MESSAGE,PUBLISH

Supported: timer,replaces

Session-Expires: 1800;refresher=uas

Content-Length:   187

Content-Disposition: session; handling=required

Content-Type: application/sdp


Points to Note:

The unknown header “Sherlock” received in the 200 OK will not be sent out.

Click to view Header details:

 

SIP Domain Flags for Require-URI header:

  • useSipDomainNameInRequestUri
  • preserveIngressRUriDomainName

SIP Domain Flags for From header:

  • useSipDomainNameInFromField
  • preserveIngressFromDomainName

DHT flag flag in IP Signaling Profile is disableHostTranslation.

Media

The SBC has the ability to anchor the following  media types:

  • Audio
  • Video Main
  • Video Extended – for Content Share
  • Binary Floor Control Protocol ( UDP and TCP)
  • Far End Camera Control ( FECC)
  • Message Session Relay Protocol ( MSRP)

For all the above mentioned media types (with the exception of Audio), the SBC consumes (i.e. does not transparently relay) the following attributes required to anchor the media:

  1. C line
  2. RTCP attributes
  3. Media direction ( a= sendrecv/sendonly/inactive/recvonly)
  4. Crypto  (the SBC terminates SRTP on a leg by leg basis)

For Audio, in addition to the above mentioned, the SBC does not transparently relay the following:

To achieve the above described behavior, enable Video (assign a valid video bandwidth) and Audio transparency by associating the following configuration with both Trunk Groups:

% set profiles media packetServiceProfile <packetServiceProfileName> packetToPacketControl transcode transcoderFreeTransparency
% set addressContext <addressContextName> zone <zoneName> sipTrunkGroup <trunkGroupName> media sdpAttributesSelectiveRelay enabled
% set profiles media packetServiceProfile <packetServiceProfileName>  videoCalls maxVideoBandwith <bandwidth>  

Example of SDP transparency with both the flags enabled the SDP relayed by SBC.

Transparency is not supported for attributes in blue font.

Incoming SDP:

c=IN IP4 10.128.44.159

b=AS:1920   

t=0 0

a=sendrecv

m=audio 3230 RTP/AVP 118 103 99 9 18 15 0 8 119

a=sendrecv

a=unknown

a=rtpmap:118 SIRENLPR/48000/1

a=fmtp:118 bitrate=64000

a=rtpmap:103 G7221/16000

a=fmtp:103 bitrate=16000

a=rtpmap:99 SIREN14/16000

a=fmtp:99 bitrate=48000

a=rtpmap:9 G722/8000

a=fmtp:9 bitrate=64000

a=rtpmap:18 G729/8000

a=fmtp:18 annexb=yes

a=rtpmap:15 G728/8000

a=rtpmap:0 PCMU/8000

a=rtpmap:8 PCMA/8000

a=rtpmap:119 telephone-event/8000

a=fmtp:119 0-15,36

a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:kW4x9MxypxiVK1ZeQlsSXpHBvLEekL8CFvpVXu7c

m=video 3232 RTP/AVP 111 96 34 31 106 116

b=TIAS:1920100

a=sendrecv

a=rtcp-fb:* nack pli

a=rtcp-fb:* ccm fir

a=rtcp-fb:* ccm tmmbr

a=vnd.polycom.forceVideoMode:9

a=rtpmap:111 H264/90000

a=fmtp:111 profile-level-id=64001f; packetization-mode=1; max-br=20010; sar=13

a=rtpmap:96 H263-1998/90000

a=fmtp:96 CIF4=1;CIF=1;QCIF=1;SQCIF=1;CUSTOM=352,240,1;CUSTOM=704,480,1;CUSTOM=1024,768,1;CUSTOM=800,600,1;CUSTOM=640,480,1;T

a=rtpmap:34 H263/90000

a=fmtp:34 CIF4=1;CIF=1;QCIF=1;SQCIF=1

a=rtpmap:31 H261/90000

a=fmtp:31 CIF=1;QCIF

a=rtpmap:106 H264-SVC/90000

a=fmtp:106 profile-level-id=56001f; packetization-mode=1; max-br=20010; sar=13

a=rtpmap:116 vnd.polycom.lpr/9000

a=fmtp:116 V=1;minPP=0;PP=150;RS=52;RP=10;PS=1400

a=crypto:1 AES_CM_128_HMAC_SHA1_80 inline:kRZIbW6v1+qXylRem15tbZJq0ym+zvDTGJpSX0nf

m=application 3238 UDP/BFCP *

a=setup:actpass

a=connection:new

a=floorctrl:c-s

m=application 3236 RTP/AVP 100

a=rtpmap:100 H224/

 

Note following missing attributes from egress invite:

  • Siren codec - not supported by SBC.
  • Telephone event 36
  • Crypto attribute – Egress not Configured for SRTP
  • Change in Video Band width
Outgoing SDP:

c=IN IP4 10.7.15.83

b=AS:1920

t=0 0

m=audio 1036 RTP/AVP 103 9 18 15 0 8 119

a=rtpmap:103 G7221/16000

a=fmtp:103 bitrate=16000

a=rtpmap:9 G722/8000

a=rtpmap:18 G729/8000

a=rtpmap:15 G728/8000

a=rtpmap:0 PCMU/8000

a=rtpmap:8 PCMA/8000

a=rtpmap:119 telephone-event/8000

a=fmtp:119 0-15

a=sendrecv

a=maxptime:40

a=unknwon

m=video 1038 RTP/AVP 111 96 34 31 106 116

b=TIAS:1920100

a=rtcp-fb:* nack pli

a=rtcp-fb:* ccm fir

a=rtcp-fb:* ccm tmmbr

a=vnd.polycom.forceVideoMode:9

a=rtpmap:111 H264/90000

a=fmtp:111 profile-level-id=64001f;packetization-mode=1;max-br=20010;sar=13

a=rtpmap:96 H263-1998/90000

a=fmtp:96 CIF4=1;CIF=1;QCIF=1;SQCIF=1;CUSTOM=352,240,1;CUSTOM=704,480,1;CUSTOM=1024,768,1;CUSTOM=800,600,1;CUSTOM=640,480,1;

a=rtpmap:34 H263/90000

a=fmtp:34 CIF4=1;CIF=1;QCIF=1;SQCIF=1

a=rtpmap:31 H261/90000

a=fmtp:31 CIF=1;QCIF=1

a=rtpmap:106 H264-SVC/90000

a=fmtp:106 profile-level-id=56001f;packetization-mode=1;max-br=20010;sar=13

a=rtpmap:116 vnd.polycom.lpr/9000

a=fmtp:116 V=1;minPP=0;PP=150;RS=52;RP=10;PS=1400

a=sendrecv

m=application 1040 UDP/BFCP *

a=setup:actpass

a=connection:new

a=floorctrl:c-s

a=sendrecv

m=application 1042 RTP/AVP 100

a=rtpmap:100 H224/4800

a=sendrecv

 

Register

Click to view Header details:

 

 

The SIP Domain flags do not have any effect on Request-URI,  From header.  If request-uri transparency is configured in transparency profile, transparency is achieved if DHT flag was enabled. If not, SBC replaced the host with the IP Peer.

 

Out-Of-Dialog message (SUBSCRIBE)

Click to view Header details:

 

 

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