[SIPForum-discussion] What all the SIP error codes can be sent before 180 ringing and after 180 ringing.

[Aniella Juverdeanu]

Theoretically it might look possible when you read the overview in section 13.1 of RFC 3261 but when you read further you can see in section 13.2.2 that  actually 180 followed by non-2XX final response doesn't make sense. Better be an early dialog followed by a non-2XX (like 183 with SDP when the caller can hear an announcement and then the call can be release with SIP error).
Also logically, when you would look at such trace it would look strange. If 180 was sent by UAS it should mean that it found the destination ready to receive the call. Eventually there would be ring no answer when a timer would be started and what node has a smaller timer could terminate this call setup.
If actually 180 is followed by a non-2XX final answer, I would have the UAS that serves the destination check this signaling - it doesn't look right, it makes no telephony sense.

Thanks,
Aniella

From: discussion-bounces at sipforum.org [mailto:discussion-bounces at sipforum.org] On Behalf Of Keyur Amin
Sent: December 24, 2011 10:41 AM
To: Rudra Kant Kanth; kondareddy godlaveety
Cc: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] What all the SIP error codes can be sent before 180 ringing and after 180 ringing.

I dont believe there is any restrictions on error responses followed by 180. I think, you can have any 4xx, 5xx or 6xx messages except for 487.

Thanks,
Keyur Amin
________________________________



________________________________
From: Rudra Kant Kanth <rudra.k1 at gmail.com>
To: kondareddy godlaveety <kondareddi24 at gmail.com>
Cc: discussion at sipforum.org
Sent: Wednesday, December 21, 2011 9:26 PM
Subject: Re: [SIPForum-discussion] What all the SIP error codes can be sent before 180 ringing and after 180 ringing.
After 180 Ringing, if the Callee rejects the call, you would see "486 Busy Here". Attached is a sample trace for it.

Regards,
Rudra



On Wed, Dec 21, 2011 at 12:49 PM, kondareddy godlaveety <kondareddi24 at gmail.com<mailto:kondareddi24 at gmail.com>> wrote:
Hi,

Can any one help me out with the follwing scenario.


can we send 4xx client error codes after sending 180 ringing?

1. if so what all the 4xx SIP error codes can be sent before SIP:180 and after SIP:180?

Can we send 5xx server Error codes after seding 180 ringing?

2. if so what all the 5xx SIP error codes can be sent before SIP:180 ringing and after SIP:180?

Can we send 6xx Global error codes after 180 ringing?

3. If so what all the 6xx error codes can be sent before 180 ringing and after SIP:180 ringing?


Regards,
Kondareddy

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