[SIPForum-discussion] SIP response during hold progress

Thu May 12 12:40:48 UTC 2011

Yes, you are right. The response should be "491 Request Pending" and
allow the other party to retry after some time.

Thanks a lot.

Regards, 

Ashok 

________________________________

From: Johnson Jagasetty [mailto:johnsetty at hotmail.com] 
Sent: Thursday, May 12, 2011 6:04 PM
To: Ashok Pitambar (WT01 - GMT-Telecom Equipment)
Subject: RE: [SIPForum-discussion] SIP response during hold progress

Hi Ashok,

This is a glare condition in telephony in which both ends seize a truck
at the same time.

I feel , When both the UAs are waiting for the response and if it
receives re-Invite request, both UAs will send 491 Request Pending
response to resolve the issue.
 The reconsideration algorithm in SIP is for the user agent to generate
a delay (randomly selected within a range determined by if the user
agent send the initial INVITE or not) then retry the re-INVITE, assuming
that another re-INVITE has not been received in the meantime. In this
way, one side or the other will "win" the race condition and have the
re-INVITE processed.

Please correct me know if I am wrong.

Regards,
Johnson

yours JOHNY

________________________________

Date: Mon, 9 May 2011 21:14:15 +0530
From: ashok.pitambar at wipro.com
To: discussion at sipforum.org
Subject: [SIPForum-discussion] SIP response during hold progress

Hi All, 

What could be the UA2's SIP response to a hold request when UA2 itself
trying put UA1 on hold 

& hold is in progress(some state in INVITE/200OK/ACK).

Race between two hold request.

Thanks &

Regards, 

Ashok 

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