Call-Info Header Forwarding

[dweidig]

I'm trying to create a paging application for paging to LinkSys SPA941 phones. The SPA941 uses ";answer-after=0" in the Call-Info header on the Invite to auto-answer for paging applications. However, it appears that 3CX is not forwarding the Call-Info header to the destination. According to RFC 3261, the Call-Info header should not be deleted by the proxy.

Are there any reasons that the Call-Info header would not be forwarded?

I've included a example 3CX logs from the LinkSys SPA941 paging to an application:

23:27:56.061|.\CallLeg.cpp(110)|Log5||CallLeg:nNewCall:[CM500002]: Info on incoming INVITE:
INVITE sip:[email protected] SIP/2.0
Via: SIP/2.0/UDP 192.168.2.125:5060;branch=z9hG4bK-37149fca
Max-Forwards: 70
Contact: "200"<sip:[email protected]:5060>
To: "102"<sip:[email protected]>
From: "200"<sip:[email protected]>;tag=9af5898bff92863eo0
Call-ID: [email protected]
CSeq: 102 INVITE
Expires: 240
Allow: ACK, BYE, CANCEL, INFO, INVITE, NOTIFY, OPTIONS, REFER
Call-Info: <sip:192.168.2.124>;answer-after=0
Proxy-Authorization: Digest username="200",realm="3CXPhoneSystem",nonce="12850288075:6da63242ae70baff2530164037428ac4",uri="sip:[email protected]",algorithm=MD5,response="fca0404742094a6addae68ccbf963c71"
User-Agent: Sipura/SPA941-4.1.8
Content-Length: 0

23:27:56.130|DialogUsageManager.cxx(800)|Debug8|Resip|::ResipLogger:SEND: INVITE sip:[email protected]:5070;rinstance=e73afb29d9474a38 SIP/2.0
Via: SIP/2.0/ ;branch=z9hG4bK-d87543-ba4cfe01055b6e2a-1--d87543-;rport
Max-Forwards: 70
Contact: <sip:[email protected]:5060>
To: <sip:[email protected]:5060>
From: "200"<sip:[email protected]>;tag=e81e9b59
Call-ID: Nzc3MzRiNzY0M2Q1NGRlYWU0ZDhlMmUwYzVlMTViZWQ.
CSeq: 1 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO
Content-Type: application/sdp
User-Agent: 3CXPhoneSystem 5.0.3790.0
Content-Length: 427

 

[archie]

3CX PhoneSystem is not a SIP proxy. That is why proxy rules are not unconditionally applicable. But we're considering implementation of paging and intercom, so this ability will appear quite soon.

 

[dweidig]

Thanks. Paging and intercom support would be great. If paging is implemented like in Asterisk, that would be great also. I found 3CX very easy to setup and most of my customers are Windows users, so would I really like to use 3CX for this application.