[reSIProcate] Early media followed by 200 OK without SDP

[Jan Granqvist]

Thanks for your quick response.


/Janne



________________________________
 Från: Scott Godin <sgodin at sipspectrum.com>
Till: Jan Granqvist <jan_granqvist at yahoo.com> 
Kopia: "resiprocate-devel at resiprocate.org" <resiprocate-devel at resiprocate.org> 
Skickat: måndag, 10 juni 2013 14:42
Ämne: Re: [reSIProcate] Early media followed by 200 OK without SDP
 


That scenario is not valid.  When using non-reliable provisional responses (ie: PRACK disabled) - if an answer is provided in a 180 response, then it must be repeated in the 200 response.

Some statements from RFC3261:
Section 13.2.1:
o  If the initial offer is in an INVITE, the answer MUST be in a reliable non-failure message from UAS back to UAC which is correlated to that INVITE.  For this specification, that is only the final 2xx response to that INVITE.  That same exact answer MAY also be placed in any provisional responses sent prior to the answer.  The UAC MUST treat the first session description it receives as the answer, and MUST ignore any session descriptions in subsequent responses to the initial INVITE. 
Section 13.3.1.4:
If the INVITE request contained an offer, and the UAS had not yet sent an answer, the 2xx MUST contain an answer.  If the INVITE did not contain an offer, the 2xx MUST contain an offer if the UAS had not yet sent an offer.

Scott

On Mon, Jun 10, 2013 at 5:26 AM, Jan Granqvist <jan_granqvist at yahoo.com> wrote:

Hi all,
>
>I’ve ran into some difficulties in an interop test towards an SBC.
>I’m using reciprocate 1.8.6 and DUM on top.
>
>The problem is as follows:
>My application initiates a SIP session towards the SBC, the SBC answers with an 180/SDP.
>The remote part answer the call which initiates a 200 OK response without SDP.
>
>Is this a valid scenario? DUM at least does not like it and terminates the call.
>Or is there a way to overcome this?
>
>
>    DUM                SBC
>
>    INVITE(SDP)   
         -->
>    100 Trying            <--
>   
 180 Ringing(SDP)        <--
>    200 OK(no SDP)            <--
>
>    ACK                -->
>    BYE                -->
>    200 OK                <--
>
>
>DEBUG | 20130610-104151.588 | SIPCService | RESIP:DUM | 5960 | DialogId.cxx:50 | DialogId::DialogId: hbQJuV6_pCllB59l0sJRCA..-75194203-00e51a.Ab2b66.Pb2b629.B2b1.Tb2b1-1
>DEBUG | 20130610-104151.589 | SIPCService | RESIP:DUM | 5960 | DialogUsageManager.cxx:1144 | Send: SipReq:  BYE 0633040109.iIiIiI.0c03d84a. at 12.3.126.42 tid=35187e552274eb58 cseq=2 BYE contact=0923000903 at 12.3.191.35 / 2 from(tu)
>INFO | 20130610-104151.589 | SIPCService | RESIP:DUM |
 5960 | ClientInviteSession.cxx:859 | Failure:  2xx with no answer: SipResp: 200 tid=8c2e757372263228 cseq=1 INVITE contact=0633040109.iIiIiI.0c03d84a. at 12.3.126.42 / 1 from(wire)
>INFO | 20130610-104151.589 | SIPCService | RESIP:DUM | 5960 | InviteSession.cxx:2703 | Transition UAC_Early -> InviteSession::Terminated
>
>
>Thanks
>/Janne
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