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- This article describes the configuration and settings necessary for removing Calling Extension/Called Extension in a Transformation Table for ext=xxxx input value.
- This document assumes that PSTN - Sonus SBC 1000/2000 - Microsoft Lync 20XX setting is completed in following topology.
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Use Case
In some cases, Lync users may be created with a Line URI with tel:+XXXXXXXXXXX;ext=XXXX format as shown below:
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In such situations, when a call is received from the Lync Mediation Server, the INVITE message contains ;ext=xxxx in the Request URI. However, in a LYNC
>> Sonus SBC 1000/2000
>> Tenor
call setup, TENOR expects the REQUEST URI without ext=xxxx, therefore Sonus SBC 1000/2000 will
(SBC) will have to remove from the
TO HEADER by using a Transformation Table.
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- Lync sends an INVITE to the Sonus SBC 1000/2000:
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INVITE sip:+15102039002;ext=9002@testux203.vxtestlab.com;user=phone SIP/2.0 FROM: "ux227-203-user2"<sip:+15102031002;ext=1002@FES1-W14.vxtestlab.com;user=phone>;epid=B2F0A127C7;tag=372e9ca59 Background Color |
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| TO: <sip:+15102039002;ext=9002@testux203.vxtestlab.com;user=phone> |
CSEQ: 197589 INVITE CALL-ID: e60f1373-93a3-44e8-985f-b1f0c03ebb69
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- SIP Registered Tenor endpoint expects the INVITE from the Sonus SBC 1000/2000:
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INVITE sip:9002@134.56.227.217:5085;user=phone SIP/2.0 From: "ux227-203-user2" <sip:+15102031002@134.56.227.203:5060;user=phone>;tag=8638e3cb-5f Background Color |
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| TO:<sip:9002@134.56.227.217;user=phone> |
CSEQ: 197589 INVITE Call-ID: call-BD0D1C00-0000-0010-0C13-C@134.56.227.203
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However, if ext=xxxx is not removed from the TO HEADER, the Sonus SBC 1000/2000 sends out an INVITE to the Tenor with:
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| SIP/2.0 503 Service Unavailable |
Call-ID: call-F96B1300-0000-0010-0C13-8@134.56.227.203 Content-Length: 0 CSeq: 1 INVITE From: "ux227-203-user2"<sip:+15102031002;ext=1002@134.56.227.203:5060;user=phone>;tag=8638e3cb-12b To: <sip:9002;ext=9002@134.56.227.217;user=phone>;tag=8638e3d9-18 User-Agent: Quintum/1.0.0 SN/0030E1209173 SW/P108-09-14-Lync Via: SIP/2.0/TCP 134.56.227.203:5060;branch=z9hG4bK-Sonus SBC 1000/2000-8638-e3cb-00d0
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Resolving the Issue
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Subsequently if the above call is placed again, the transformation table will modify the TO header and remove ext=xxxx which then allow call to be successful as shown below:
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| INVITE sip:+15102039002;ext=9002@testux203.vxtestlab.com;user=phone SIP/2.0 |
FROM: "ux227-203-user2"<sip:+15102031002;ext=1002@FES1-W14.vxtestlab.com;user=phone>;epid=B2F0A127C7;tag=6648b75d48
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| TO: <sip:+15102039002;ext=9002@testux203.vxtestlab.com;user=phone> |
CSEQ: 197673 INVITE CALL-ID: 6a8e8f94-b0c7-4bfe-83b9-e03e638ef1fd
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Sonus SBC 1000/2000 Removes the ext=xxxx, using the Transformation Table and Routes the Call
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| SIP/2.0 200 OK |
Call-ID: call-BD0D1C00-0000-0010-0C13-C@134.56.227.203 Contact: <sip:9002@134.56.227.217:5085;user=phone> Content-Length: 253 Content-Type: application/sdp CSeq: 1 INVITE From: "ux227-203-user2"<sip:+15102031002@134.56.227.203:5060;user=phone>;tag=8638e3cb-5f To: <sip:9002@134.56.227.217;user=phone>;tag=8638e3d9-26
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