3CX server doesn't accept ACK on 200 OK

[Jeroen]

When I try to make a call with my SIP device to a SIP Phone the 3CX server doesn't accept my ACK on the 200 OK when the Phone is picked up it repeats the 200 OK serveral times and then disconnects the session.
This is how the messages look:

INVITE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 192.168.0.179:5060;branch=z9hG4bK9b198305313d45b9
From: "101" <sip:[email protected]>;tag=7967
To: "100" <sip:[email protected]>
Contact: <sip:[email protected]:5060>
Call-ID: 9b1983051da148cc
CSeq: 3 INVITE
Supported:
Allow: INVITE,ACK,CANCEL,BYE,INFO
Max-Forwards: 70

Content-Type: application/sdp
Content-Length: 134

v=0
o=- 1 1 IN IP4 192.168.0.179
s=SIP Call
c=IN IP4 192.168.0.179
t=0 0
m=audio 5062 RTP/AVP 8
a=sendrecv
a=rtpmap:8 PCMA/8000

SIP/2.0 407 Proxy Authentication Required
Via: SIP/2.0/UDP 192.168.0.179:5060;branch=z9hG4bK9b198305313d45b9
Proxy-Authenticate: Digest nonce="414d535c0afe7a4b10:ad3659e4a570f563653a2e230079473f",algorithm=MD5,realm="3CXPhoneSystem"
To: "100"<sip:[email protected]>;tag=5d18f214
From: "101"<sip:[email protected]>;tag=7967
Call-ID: 9b1983051da148cc
CSeq: 3 INVITE
User-Agent: 3CXPhoneSystem 12.5.39117.982 (38810)
Content-Length: 0

ACK sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 192.168.0.179:5060;branch=z9hG4bK9b198305313d45b9
From: "101" <sip:[email protected]>;tag=7967
To: "100" <sip:[email protected]>
Contact: <sip:[email protected]:5060>
Call-ID: 9b1983051da148cc
CSeq: 3 ACK

Supported:
Allow: INVITE,ACK,CANCEL,BYE,INFO
Max-Forwards: 70
Content-Length: 0

INVITE sip:[email protected] SIP/2.0
Proxy-Authorization: Digest algorithm=MD5, username="101", uri="sip:[email protected]", realm="3CXPhoneSystem", nonce="414d535c0afe7a4b10:ad3659e4a570f563653a2e230079473f", response="7ec3df08d8b4f2b6a662313ce348f772"
Via: SIP/2.0/UDP 192.168.0.179:5060;branch=z9hG4bK9b1983054f764d48
From: "101" <sip:[email protected]>;tag=7967
To: "100" <sip:[email protected]>
Contact: <sip:[email protected]:5060>
Call-ID: 9b1983051da148cc
CSeq: 4 INVITE
Supported:
Allow: INVITE,ACK,CANCEL,BYE,INFO
Max-Forwards: 70
Content-Type: application/sdp
Content-Length: 134

v=0
o=- 1 1 IN IP4 192.168.0.179
s=SIP Call
c=IN IP4 192.168.0.179
t=0 0
m=audio 5062 RTP/AVP 8
a=sendrecv
a=rtpmap:8 PCMA/8000

SIP/2.0 100 Trying
Via: SIP/2.0/UDP 192.168.0.179:5060;branch=z9hG4bK9b1983054f764d48
To: "100" <sip:[email protected]>
From: "101" <sip:[email protected]>;tag=7967
Call-ID: 9b1983051da148cc
CSeq: 4 INVITE
Content-Length: 0

SIP/2.0 180 Ringing
Via: SIP/2.0/UDP 192.168.0.179:5060;branch=z9hG4bK9b1983054f764d48
Contact: <sip:[email protected]>
To: "100"<sip:[email protected]>;tag=fd48cf23
From: "101"<sip:[email protected]>;tag=7967
Call-ID: 9b1983051da148cc
CSeq: 4 INVITE
User-Agent: 3CXPhoneSystem 12.5.39117.982 (38810)
Content-Length: 0

SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.0.179:5060;branch=z9hG4bK9b1983054f764d48
Contact: <sip:[email protected]:5060>
To: "100"<sip:[email protected]>;tag=fd48cf23
From: "101"<sip:[email protected]>;tag=7967
Call-ID: 9b1983051da148cc
CSeq: 4 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Content-Type: application/sdp
Supported: replaces
User-Agent: 3CXPhoneSystem 12.5.39117.982 (38810)
Content-Length: 170

v=0
o=3cxPS 119286005760 440049598465 IN IP4 192.168.0.112
s=3cxPS Audio call
c=IN IP4 192.168.0.112
t=0 0
m=audio 7004 RTP/AVP 8
a=rtpmap:8 PCMA/8000
a=sendrecv

After this ACK the 200 OK message is repeaded several times and then the session is disconnected.

ACK sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 192.168.0.179:5060;branch=z9hG4bK9b1983054f764d48
From: "101" <sip:[email protected]>;tag=7967
To: "100" <sip:[email protected]>
Contact: <sip:[email protected]:5060>
Call-ID: 9b1983051da148cc
CSeq: 4 ACK
Supported:
Allow: INVITE,ACK,CANCEL,BYE,INFO
Max-Forwards: 70
Content-Length: 0

SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.0.179:5060;branch=z9hG4bK9b1983054f764d48
Contact: <sip:[email protected]:5060>
To: "100"<sip:[email protected]>;tag=fd48cf23
From: "101"<sip:[email protected]>;tag=7967
Call-ID: 9b1983051da148cc
CSeq: 4 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE
Content-Type: application/sdp
Supported: replaces
User-Agent: 3CXPhoneSystem 12.5.39117.982 (38810)
Content-Length: 170

v=0
o=3cxPS 119286005760 440049598465 IN IP4 192.168.0.112
s=3cxPS Audio call
c=IN IP4 192.168.0.112
t=0 0
m=audio 7004 RTP/AVP 8
a=rtpmap:8 PCMA/8000
a=sendrecv

 

[leejor]

A few questions...

Did this just start happening? New install? New sets?

When I try to make a call with my SIP device to a SIP Phone the 3CX server doesn't accept my ACK

What are you using, in other words, what is the SIP device and the SIP Phone? make/ model/ firmware?

 

[Jeroen]

On one side Im using a Grandstream GXP2000, that seems to work fine.
On the other side im using a embedded deveice we build our selfs, it worked fine with version 8 of 3CX but now it has to work with the new version 12.

 

[Jeroen]

I have found the problem, the ACK on the 200 Ok was missing the tag in the To: .... line