[SIPForum-discussion] 183 response code

[Gonzalo Gasca]

I don¹t want to hijack your thread, but I have a similar scenario when I
place calls to 1800 numbers.
Topology:

SIP phone --> B2BUA --> VoiceGW --> PSTN

When I dial PSTN 1800 number Im suppose to get IVR answer immediately, but I
get ringback tone instead.
>From PSTN I receive an ISDN progress message with PI to cut through media,
this  is translated to
183 Session Progress with SDP all the way to SIP phone, but SIP phone
instead plays ringback
All 100rel and PRACK is taking care of in B2BUA and we forward proper 183
with SDP to SIP Phone

My question is:
Which RFC describes opening media path on receipt of a 183 response
or what is expected behavior in this scenario.

Thanks

Below SDP sent to SIP Phone

17:55:23.783 |//SIP/SIPTcp/wait_SdlSPISignal: Outgoing SIP TCP message to
10.35.204.91 on port 60087 index 35112
SIP/2.0 183 Session Progress

Via: SIP/2.0/TLS 10.35.204.91:60087;branch=z9hG4bK7644da3e

From: "2323488" <sip:2323488 at X.Y.W.Z>;tag=001da2392141006752a9dcd6-00d07ad0

To: 
<sip:91866XXXXXXX at X.Y.W.Z>;tag=e614205a-b2f8-488c-a6dd-70a296684bab-39977403

Date: Sat, 04 Dec 2010 01:55:22 GMT

Call-ID: 001da239-21410009-159f55b2-55e0fa5c at 10.35.204.91

CSeq: 101 INVITE

Allow: INVITE, OPTIONS, INFO, BYE, CANCEL, ACK, PRACK, UPDATE, REFER,
SUBSCRIBE, NOTIFY

Allow-Events: presence, kpml

Contact: <sip:91866XXXXXXX at X.Y.W.Z:5061;transport=tls>

Call-Info: <urn:x-cisco-remotecc:callinfo>; security= NotAuthenticated;
orientation= to; gci= 2-140226; call-instance= 1

Send-Info: conference

Remote-Party-ID: 
<sip:91866XXXXXXX at X.Y.W.Z>;party=called;screen=no;privacy=off

Content-Type: application/sdp

Content-Length: 405



v=0

o=CiscoSystemsCCM-SIP 2000 1 IN IP4 X.Y.W.Z

s=SIP Call

t=0 0

m=audio 18758 RTP/AVP 0 101

c=IN IP4 10.35.195.98

a=rtpmap:0 PCMU/8000

a=ptime:20

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

m=video 0 RTP/AVP 31 34 96 97

c=IN IP4 0.0.0.0

a=rtpmap:31 H261/90000

a=fmtp:31 

a=rtpmap:34 H263/90000

a=fmtp:34 MAXBR=1

a=rtpmap:96 H263-1998/90000

a=rtpmap:97 H264/90000

a=inactive




--
Gonzalo Gasca


From: AMIT ANAND <amiit.anand at gmail.com>
Date: Sat, 4 Dec 2010 18:30:17 +0530
To: Jing Jiang <jjiang at biamp.com>
Cc: "discussion at sipforum.org" <discussion at sipforum.org>
Subject: Re: [SIPForum-discussion] 183 response code


No need to respond until it has require:100 REL, in case it has require :
100REL then you need to send PRACK for it..
 

 
On Sat, Dec 4, 2010 at 1:22 AM, Jing Jiang <jjiang at biamp.com> wrote:
> When 183 response message  with SDP is received, should the client ack this
> message?
>  
> 
> Jing Jiang 
>  
> 
> 
> 
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-- 
Thanks
Amit Anand


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