Hello,
I have some trouble with sdp negotiation after received re-invites.
In my application (running with sofia 1.12.8) I start a call to an ISP.
The call to nua_invite() contains SOATAG_USER_SDP_STR and NUTAG_AUTOANSWER(0) to
handle re-invites in my application later.
The call is established correctly. Then the ISP wants to switch to T.38. It
sends a re-invite with changed sdp. My application gets the nua_i_invite and
later the nua_i_state which I use to handle remote sdp.
>From nua_i_state callback my application calls nua_respond with
>SOATAG_USER_SDP_STR
containing my modified sdp.
The Problem now is, that sofia-sip increases the sdp version in o-line by two
and
not by one as stated in RFC 3264 section 8:
"When issuing an offer that modifies the session,
the "o=" line of the new SDP MUST be identical to that in the
previous SDP, except that the version in the origin field MUST
increment by one from the previous SDP. "
Version in my INVITE: 4138572302028389133
Version in my Answer to Re-INVITE: 4138572302028389135
What happens now is, that the ISP ignores my sdp. Seems that they have
a very strict implementation there...
Can anyone please give me a hint on how to fix this problem?
Timo
**************************************************************************************************
SEND Request-Line: INVITE sip:[EMAIL PROTECTED];transport=udp SIP/2.0
Message body
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): - 8396384725478307013
4138572302028389133 IN IP4 192.168.172.42
Session Name (s): -
Connection Information (c): IN IP4 192.168.172.42
Time Description, active time (t): 0 0
Media Description, name and address (m): audio 49156 RTP/AVP 8 0
13 111
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute (a): rtpmap:0 PCMU/8000
Media Attribute (a): rtpmap:13 CN/8000
Media Attribute (a): rtpmap:111 telephone-event/8000
Media Attribute (a): fmtp:111 0-15
RECV Status-Line: SIP/2.0 183 Session Progress
Message body
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): - 295984490200000252 1 IN IP4
222.222.222.222
Session Name (s): session
Connection Information (c): IN IP4 222.222.222.222
Time Description, active time (t): 0 0
Media Description, name and address (m): audio 11090 RTP/AVP 8 111
Media Attribute (a): rtpmap:8 PCMA/8000
Media Attribute (a): ptime:20
Media Attribute (a): sendrecv
Media Attribute (a): rtpmap:111 telephone-event/8000
RECV Status-Line: SIP/2.0 200 Ok
SEND Request-Line: ACK sip:213.218.28.164:5060 SIP/2.0
***SIP-Provider sends Re-Invite to switch to T.38:
RECV Request-Line: INVITE sip:[EMAIL PROTECTED]:5071 SIP/2.0
Message body
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): - 295984490200000252 2 IN IP4
222.222.222.222
Session Name (s): session
Connection Information (c): IN IP4 222.222.222.222
Time Description, active time (t): 0 0
Media Description, name and address (m): image 11090 udptl t38
***I send 200ok with modified SDP using nua_respond
SEND Status-Line: SIP/2.0 200 OK
Message body
Session Description Protocol
Session Description Protocol Version (v): 0
Owner/Creator, Session Id (o): - 8396384725478307013
4138572302028389135 IN IP4 192.168.172.42
Session Name (s): -
Connection Information (c): IN IP4 192.168.172.42
Time Description, active time (t): 0 0
Media Description, name and address (m): image 49156 UDPTL t38
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