I am having an issue with Shared lines. My setup is this Freeswitch (Version 1.3.17+git~20130312T033518Z~7d29a92f55) -> Acme SBC -> Polycom 550 (PolycomSoundPointIP-SPIP_550-UA/4.0.3.7562) .

If I point the Polycom phone directly to freeswitch everything works as it should. The issue appears when I route though the Acme SBC.. When I make a call from the Polycom 550, I get a 15sec pause and then the call completes. After much investigation, I have discovered that the issue appears to be that freeswitch sends a notify with a from_tag that is not part of an established dialog and my SBC responds with 481 Missing Dialog.

Looking at the sip trace below the phone subscribes -> Freeswitch Accepts(with correct from tag) ->freeswitch then sends a Notify with wrong from_tag. ->SBC responds with 481. The odd part is that that after the phone times out and re-subscribes this time Freeswitch sends a Notify with the same form_tag as the Accept and the call completes and SCA works fine. Below is the siptrace between freeswitch and my SBC

Anyone have any ideas what this might be?

Thanks

Doug

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SUBSCRIBE sip:1234567890@fs.domain.com:5060 SIP/2.0

Via: SIP/2.0/UDP 10.10.10.9:5060;branch=z9hG4bKpsndha200gk1fu8df4d0.2

From: "1234567890" <sip:1234567890@sip.domain.com>;tag=7F95269B-FA2A50CA

To: <sip:1234567890@sip.domain.com>

CSeq: 1 SUBSCRIBE

Call-ID: 1aa7577-9c569066-3952c105@192.168.200.105

Contact: <sip:1234567890@10.10.10.9:5060;ep=192.168.200.105;transport=udp>

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

Event: line-seize

Call-Info: <sip:sip.domain.com>;appearance-index=1

User-Agent: PolycomSoundPointIP-SPIP_550-UA/4.0.3.7562

Accept-Language: en

Max-Forwards: 69

Expires: 30

Content-Length: 0

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send 813 bytes to udp/[10.10.10.9]:5060 at 17:38:11.774056:

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SIP/2.0 202 Accepted

Via: SIP/2.0/UDP 10.10.10.9:5060;branch=z9hG4bKpsndha200gk1fu8df4d0.2

From: "1234567890" <sip:1234567890@sip.domain.com>;tag=7F95269B-FA2A50CA

To: <sip:1234567890@sip.domain.com>;tag=DKrccCoqCvac

Call-ID: 1aa7577-9c569066-3952c105@192.168.200.105

CSeq: 1 SUBSCRIBE

Contact: <sip:1234567890@10.10.10.10:5060>

Expires: 30

User-Agent: FreeSWITCH-mod_sofia/1.3.17+git~20130312T033518Z~7d29a92f55

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

Supported: timer, precondition, path, replaces

Allow-Events: talk, hold, conference, presence, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer

Subscription-State: active;expires=30

Content-Length: 0

------------------------------------------------------------------------

send 968 bytes to udp/[10.10.10.9]:5060 at 17:38:11.774279:

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NOTIFY sip:1234567890@10.10.10.9:5060;ep=192.168.200.105;transport=udp SIP/2.0

Via: SIP/2.0/UDP 10.10.10.10;rport;branch=z9hG4bKvg7p3cN60g7aQ

Max-Forwards: 70

From: <sip:1234567890@sip.domain.com>;tag=939D8tZtU5g7m

To: "1234567890" <sip:1234567890@sip.domain.com>;tag=7F95269B-FA2A50CA

Call-ID: 1aa7577-9c569066-3952c105@192.168.200.105

CSeq: 41262081 NOTIFY

Contact: <sip:1234567890@10.10.10.10:5060>

Expires: 30

Call-Info: <sip:sip.domain.com>;appearance-index=1

User-Agent: FreeSWITCH-mod_sofia/1.3.17+git~20130312T033518Z~7d29a92f55

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

Supported: timer, precondition, path, replaces

Event: line-seize

Allow-Events: talk, hold, conference, presence, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer

Subscription-State: active;expires=30

Content-Length: 0

------------------------------------------------------------------------

send 1077 bytes to udp/[10.10.10.9]:5060 at 17:38:11.775249:

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NOTIFY sip:1234567890@10.10.10.9:5060;ep=192.168.200.105;transport=udp SIP/2.0

Via: SIP/2.0/UDP 10.10.10.10;rport;branch=z9hG4bKXS0F5759XSXXj

Max-Forwards: 70

From: <sip:1234567890@sip.domain.com>;tag=2OCFR236kQ0l

To: "1234567890" <sip:1234567890@sip.domain.com>;tag=882868A3-8F845D52

Call-ID: dab1917f-2f9a96ee-a7f17a0d@192.168.200.105

CSeq: 505025480 NOTIFY

Contact: <sip:1234567890@10.10.10.10:5060;transport=udp>

Call-Info: <sip:sip.domain.com>;appearance-index=1;appearance-state=seized

Call-Info: <sip:sip.domain.com>;appearance-index=*;appearance-state=idle

User-Agent: FreeSWITCH-mod_sofia/1.3.17+git~20130312T033518Z~7d29a92f55

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

Supported: timer, precondition, path, replaces

Event: call-info

Allow-Events: talk, hold, conference, presence, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer

Subscription-State: active;expires=587

Content-Length: 0

------------------------------------------------------------------------

recv 344 bytes from udp/[10.10.10.9]:5060 at 17:38:11.777251:

------------------------------------------------------------------------

SIP/2.0 481 Missing Dialog

Via: SIP/2.0/UDP 10.10.10.10;received=10.10.10.10;branch=z9hG4bKvg7p3cN60g7aQ;rport=5060

From: <sip:1234567890@sip.domain.com>;tag=939D8tZtU5g7m

To: "1234567890" <sip:1234567890@sip.domain.com>;tag=7F95269B-FA2A50CA

Call-ID: 1aa7577-9c569066-3952c105@192.168.200.105

CSeq: 41262081 NOTIFY

------------------------------------------------------------------------