[asterisk-dev] sdpversion handling

[Olle E. Johansson]

12 nov 2009 kl. 17.43 skrev Freddi Hansen:

> I have a situation where I think that we are not handling things correct 
> with regards to the sdpversion.
> 
> outbound INVITE to sip proxy (Siemens SurPass).
> ...
> gets 183 with SDP back.
> ..
> Gets 200 OK with SDP
> 
> sends ACK and BYE.    (asterisk disconnects the call on B-answer)
> 
> what happens is that the sdpversion we receive in the 183 and in the 200 
> OK have same version number so we should as I understand it simply 
> ignore the SDP with the 200 OK as there is no new info.
> The sdpversioncheck  in process_sdp fails  and causes  the  
> SIP_PENDINGBYE to be set  so outbound call  fails.
> with ignoresdpversion=yes  then  this works perfect.

Please report this as a bug in the bug tracker. Also note that the SDP version belongs to one early dialog only. 
The 200 OK can arrive from another device with different tags/branches and then it's ok to have another SDPversion.

/O
> 
>        case 200:       /* 200 OK on invite - someone's answering our 
> call */
>                if (!req->ignore && (p->invitestate != INV_CANCELLED) && 
> sip_cancel_destroy(p))
>                        ast_log(LOG_WARNING, "Unable to cancel SIP 
> destruction.  Expect bad things.\n");
>                p->authtries = 0;
>                if (find_sdp(req)) {
>                        if ((res = process_sdp(p, req, SDP_T38_ACCEPT)) 
> && !req->ignore) {
>                                if (!reinvite)
>                                        /* This 200 OK's SDP is not 
> acceptable, so we need to ack, then hangup */
>                                        /* For re-invites, we try to 
> recover */
>                                        ast_set_flag(&p->flags[0], 
> SIP_PENDINGBYE);
>                        }
>                }
> b.r.
> Freddi
> 
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---
* Olle E Johansson - oej at edvina.net
* Cell phone +46 70 593 68 51, Office +46 8 96 40 20, Sweden