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No ring back tone heard on SIP trunks

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amilalex

amilalex

Technical User
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Nov 17, 2008
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I have a BCM50 3.0 system connected to a CS1000 5.5 via SIP trunks for outgoing calls over an E1 PRI. When a user places a call from the BCM to an external analog trunk number no ring back tone is heard but the phone on the far-end rings. When a call is made to an external digital trunk number ring back is heard and the same for calls to the mobile network.

Does anyone have any possible solutions or guidance in a direction which we could investigate?

 
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humm, what kind of phone you calling from? I know with SIP, the "ringback" is generated locally by the calling set. Have you done a SIP trace on the call to see if you see anything funky?

Kick on a SIP trace:


oam> SIPOutput 1
oam> SIPTraceLevel 1
oam> SIPCallTrace on


then do a test call . . .
 
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The phones are digital T-series phones configured on the BCM50. I did a SIP trace as you suggested and notice a difference between the calls mainly the trying and session progress messages. What I have found out also is that the calls from the main site have no issues i.e. ring back is heard on all calls made where the E1 is directly connected.
 
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SIPCallTrace: (25/10/10 16:05:20) Incoming -- method BYE(2) chid: 0 Far End Signaling IP: 10.21.45.4:5060 Calling: 7201 Called : 94526197
SIPCallTrace: (25/10/10 16:05:20)
BYE sip:94526197;phone-context=UnknownUnknown@fnbslu.com:5060;maddr=10.21.6.6;transport=udp;user=phone SIP/2.0
From: <sip:7201@10.21.45.4;user=phone>;tag=10896e58-a152d04-13c4-4cc5e29e-6a485cb9-4cc5e29e
SIPCallTrace: (25/10/10 16:05:20)
To: <sip:94526197@fnbslu.com;user=phone>;tag=2408e058-606150a-13c4-40030-2bd52b-3e040b13-2bd52b
Call-ID: 108a2208-a152d04-13c4-4cc5e29e-1d59b6b0-4cc5e29e@10.21.45.4
CSeq: 2 BYE
SIPCallTrace: (25/10/10 16:05:20)
Via: SIP/2.0/UDP 10.21.45.4:5060;branch=z9hG4bK-4cc5e432-e50366d9-5f779037
Max-Forwards: 70
Supported: 100rel,sipvc,x-nortel-sipvc,replaces
User-Agent: Nortel Networks BCM VoIP Gateway release_43 version_43.186.0.33
SIPCallTrace: (25/10/10 16:05:20)
x-nt-corr-id: 108a2208-a152d04-13c4-4cc5e29e-1d59b6b0-4cc5e29e@10.21.45.4
Allow: INVITE,UPDATE,INFO,ACK,OPTIONS,CANCEL,BYE,NOTIFY,PRACK,REFER
Content-Type: multipart/mixed;boundary=unique-boundary-1;version=1;base=BCMv4
SIPCallTrace: (25/10/10 16:05:20)
Content-Length: 347

--unique-boundary-1
Content-Type: application/x-nt-mcdn-frag-hex;version=1;base=BCMv4
Content-Disposition: signal;handling=optional

45000b0b
0706050080001000
--unique-boundary-1
SIPCallTrace: (25/10/10 16:05:20)
Content-Type: application/x-nt-epid-frag-hex;version=1;base=BCMv4
Content-Disposition: signal;handling=optional

010706
0a0a6301ffff
--unique-boundary-1--


SIPCallTrace: (25/10/10 16:05:20) Outgoing -- response 200 OK chid: 0 Far End Signaling IP: 10.21.45.4:5060 Calling: 7201 Called : 94526197
SIPCallTrace: (25/10/10 16:05:20)
SIP/2.0 200 OK
From: <sip:7201@10.21.45.4;user=phone>;tag=10896e58-a152d04-13c4-4cc5e29e-6a485cb9-4cc5e29e
To: <sip:94526197@fnbslu.com;user=phone>;tag=2408e058-606150a-13c4-40030-2bd52b-3e040b13-2bd52b
SIPCallTrace: (25/10/10 16:05:20)
Call-ID: 108a2208-a152d04-13c4-4cc5e29e-1d59b6b0-4cc5e29e@10.21.45.4
CSeq: 2 BYE
Via: SIP/2.0/UDP 10.21.45.4:5060;branch=z9hG4bK-4cc5e432-e50366d9-5f779037
Supported: 100rel,x-nortel-sipvc,replaces,timer
SIPCallTrace: (25/10/10 16:05:20)
User-Agent: Nortel CS1000 SIP GW release_5.0 version_sse-5.50.12
Content-Length: 0





SIPCallTrace: (25/10/10 15:54:48) Outgoing -- response 100 Trying chid: 0 Far End Signaling IP: 10.21.45.4:5060 Calling: 7224 Called : 94539000
SIPCallTrace: (25/10/10 15:54:48)
SIP/2.0 100 Trying
From: <sip:7224@10.21.45.4;user=phone>;tag=10893ff0-a152d04-13c4-4cc5e1bc-4a14f6d7-4cc5e1bc
To: <sip:94539000@fnbslu.com;user=phone>
Call-ID: 108a09a8-a152d04-13c4-4cc5e1bc-6ed09047-4cc5e1bc@10.21.45.4
SIPCallTrace: (25/10/10 15:54:48)
CSeq: 1 INVITE
Via: SIP/2.0/UDP 10.21.45.4:5060;branch=z9hG4bK-4cc5e1bc-e4f9c6e5-104fdadd
Supported: 100rel,x-nortel-sipvc,replaces,timer
User-Agent: Nortel CS1000 SIP GW release_5.0 version_sse-5.50.12
SIPCallTrace: (25/10/10 15:54:48)
Contact: <sip:94539000@fnbslu.com;maddr=10.21.6.6;transport=udp;user=phone>
Allow: INVITE,ACK,BYE,REGISTER,REFER,NOTIFY,CANCEL,PRACK,OPTIONS,INFO,SUBSCRIBE,UPDATE
Content-Length: 0



SIPCallTrace: (25/10/10 15:54:51) Outgoing -- response 183 Session Progress chid: 0 Far End Signaling IP: 10.21.45.4:5060 Calling: 7224 Called : 94539000
SIPCallTrace: (25/10/10 15:54:51)
SIP/2.0 183 Session Progress
From: <sip:7224@10.21.45.4;user=phone>;tag=10893ff0-a152d04-13c4-4cc5e1bc-4a14f6d7-4cc5e1bc
To: <sip:94539000@fnbslu.com;user=phone>;tag=24088c78-606150a-13c4-40030-2bd43b-1f82a2ec-2bd43b
SIPCallTrace: (25/10/10 15:54:51)
Call-ID: 108a09a8-a152d04-13c4-4cc5e1bc-6ed09047-4cc5e1bc@10.21.45.4
CSeq: 1 INVITE
Via: SIP/2.0/UDP 10.21.45.4:5060;branch=z9hG4bK-4cc5e1bc-e4f9c6e5-104fdadd
Supported: 100rel,x-nortel-sipvc,replaces,timer
Require: 100rel
SIPCallTrace: (25/10/10 15:54:51)
User-Agent: Nortel CS1000 SIP GW release_5.0 version_sse-5.50.12
x-nt-corr-id: 108a09a8-a152d04-13c4-4cc5e1bc-6ed09047-4cc5e1bc@10.21.45.4
RSeq: 855
SIPCallTrace: (25/10/10 15:54:51)
Contact: <sip:94539000;phone-context=UnknownUnknown@fnbslu.com:5060;maddr=10.21.6.6;transport=udp;user=phone>
Allow: INVITE,ACK,BYE,REGISTER,REFER,NOTIFY,CANCEL,PRACK,OPTIONS,INFO,SUBSCRIBE,UPDATE
SIPCallTrace: (25/10/10 15:54:51)
Content-Type: multipart/mixed;boundary=unique-boundary-1
Content-Length: 666

--unique-boundary-1
Content-Type: application/sdp

v=0
o=- 11638 1 IN IP4 10.21.6.6
s=-
t=0 0
m=audio 5202 RTP/AVP 0 120 111
SIPCallTrace: (25/10/10 15:54:51)
c=IN IP4 10.21.6.4
a=rtpmap:120 telephone-event/8000
a=fmtp:120 0-15
a=rtpmap:111 X-nt-inforeq/8000
a=ptime:20
a=maxptime:20
a=sendrecv

--unique-boundary-1
SIPCallTrace: (25/10/10 15:54:51)
Content-Type: application/x-nt-mcdn-frag-hex;version=sse-5.50.12;base=x2611
Content-Disposition: signal;handling=optional

01008181
460e01000a0001000100010000000000
--unique-boundary-1
SIPCallTrace: (25/10/10 15:54:51)
Content-Type: application/x-nt-epid-frag-hex;version=sse-5.50.12;base=x2611
Content-Disposition: signal;handling=optional

011201
00:21:e1:fb:5b:0d
--unique-boundary-1--


SIPCallTrace: (25/10/10 15:54:51) Incoming -- method PRACK(7) chid: 0 Far End Signaling IP: 10.21.45.4:5060 Calling: 7224 Called : 94539000
SIPCallTrace: (25/10/10 15:54:51)
PRACK sip:94539000;phone-context=UnknownUnknown@fnbslu.com:5060;maddr=10.21.6.6;transport=udp;user=phone SIP/2.0
From: <sip:7224@10.21.45.4;user=phone>;tag=10893ff0-a152d04-13c4-4cc5e1bc-4a14f6d7-4cc5e1bc
SIPCallTrace: (25/10/10 15:54:51)
To: <sip:94539000@fnbslu.com;user=phone>;tag=24088c78-606150a-13c4-40030-2bd43b-1f82a2ec-2bd43b
Call-ID: 108a09a8-a152d04-13c4-4cc5e1bc-6ed09047-4cc5e1bc@10.21.45.4
CSeq: 2 PRACK
SIPCallTrace: (25/10/10 15:54:51)
Via: SIP/2.0/UDP 10.21.45.4:5060;branch=z9hG4bK-4cc5e1be-e4f9cfc5-5f18dae5
Content-Disposition: signal;handling=optional
RAck: 855 1 INVITE
Max-Forwards: 70
Supported: 100rel,sipvc,x-nortel-sipvc,replaces
SIPCallTrace: (25/10/10 15:54:51)
User-Agent: Nortel Networks BCM VoIP Gateway release_43 version_43.186.0.33
x-nt-corr-id: 108a09a8-a152d04-13c4-4cc5e1bc-6ed09047-4cc5e1bc@10.21.45.4
Allow: INVITE,UPDATE,INFO,ACK,OPTIONS,CANCEL,BYE,NOTIFY,PRACK,REFER
SIPCallTrace: (25/10/10 15:54:51)
Content-Type: application/x-nt-epid-frag-hex;version=1;base=BCMv4
Content-Length: 20

010706
0a0a6301ffff

SIPCallTrace: (25/10/10 15:54:51) Outgoing -- response 200 OK chid: 0 Far End Signaling IP: 10.21.45.4:5060 Calling: 7224 Called : 94539000
SIPCallTrace: (25/10/10 15:54:51)
SIP/2.0 200 OK
From: <sip:7224@10.21.45.4;user=phone>;tag=10893ff0-a152d04-13c4-4cc5e1bc-4a14f6d7-4cc5e1bc
To: <sip:94539000@fnbslu.com;user=phone>;tag=24088c78-606150a-13c4-40030-2bd43b-1f82a2ec-2bd43b
SIPCallTrace: (25/10/10 15:54:51)
Call-ID: 108a09a8-a152d04-13c4-4cc5e1bc-6ed09047-4cc5e1bc@10.21.45.4
CSeq: 2 PRACK
Via: SIP/2.0/UDP 10.21.45.4:5060;branch=z9hG4bK-4cc5e1be-e4f9cfc5-5f18dae5
Supported: 100rel,x-nortel-sipvc,replaces,timer
SIPCallTrace: (25/10/10 15:54:51)
User-Agent: Nortel CS1000 SIP GW release_5.0 version_sse-5.50.12
x-nt-corr-id: 108a09a8-a152d04-13c4-4cc5e1bc-6ed09047-4cc5e1bc@10.21.45.4
Allow: INVITE,ACK,BYE,REGISTER,REFER,NOTIFY,CANCEL,PRACK,OPTIONS,INFO,SUBSCRIBE,UPDATE
SIPCallTrace: (25/10/10 15:54:51)
Content-Length: 0






010706
0a0a6301ffff
 
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