[SIPForum-discussion] SIP response during hold progress

Fri May 13 10:41:01 UTC 2011

Resending the message...

Hi,

This is a glare condition in telephony in which both ends seize a trunk 
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

From: saigop at gmail.com
Date: Thu, 12 May 2011 17:34:10 +0530
To: ashok.pitambar at wipro.com
CC: discussion at sipforum.org
Subject: Re: [SIPForum-discussion] SIP response during hold progress

I have not seen in RFC but I have experienced with wireshark some time back. 

On Thu, May 12, 2011 at 5:04 PM,  <ashok.pitambar at wipro.com> wrote:

Hi Gopal, 

Is this mentioned any RFC or somewhere in
offer/Answer model? After 200OK only UA will update the media, is this reason 

Why you are saying 200OK?

Regards, 

Ashok 

From: Gopalakrishnan
A.N [mailto:saigop at gmail.com] 

Sent: Thursday, May 12, 2011 4:46
PM

To: Ashok
 Pitambar (WT01 - GMT-Telecom Equipment)

Cc: discussion at sipforum.org

Subject: Re: [SIPForum-discussion]
SIP response during hold progress

200 ok will be the
response

On Mon, May 9, 2011 at 9:14 PM, <ashok.pitambar at wipro.com> wrote:

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 

_______________________________________________

This is the SIP Forum discussion mailing list

TO UNSUBSCRIBE, or edit your delivery options, please visit http://sipforum.org/mailman/listinfo/discussion

Post to the list at discussion at sipforum.org

-- 

Thank you  with regards,

Gopalakrishnan A.N.

VoIP call - sip:saigop at gtalk2voip.com

 Please do not print this email unless it is absolutely necessary. 

 The information contained in this electronic message and any attachments to this message are intended for the exclusive use of the addressee(s) and may contain proprietary, confidential or privileged information. If you are not the intended recipient, you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately and destroy all copies of this message and any attachments. 

WARNING: Computer viruses can be transmitted via email. The recipient should check this email and any attachments for the presence of viruses. The company accepts no liability for any damage caused by any virus transmitted by this email. 

www.wipro.com

-- 
Thank you  with regards,
Gopalakrishnan A.N.VoIP call - sip:saigop at gtalk2voip.com

_______________________________________________
This is the SIP Forum discussion mailing list
TO UNSUBSCRIBE, or edit your delivery options, please visit http://sipforum.org/mailman/listinfo/discussion
Post to the list at discussion at sipforum.org 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://sipforum.org/pipermail/discussion/attachments/20110513/a3d0abb9/attachment-0002.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: image001.jpg
Type: image/jpeg
Size: 6652 bytes
Desc: not available
URL: <http://sipforum.org/pipermail/discussion/attachments/20110513/a3d0abb9/attachment-0002.jpg>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: sip.png
Type: image/png
Size: 55901 bytes
Desc: not available
URL: <http://sipforum.org/pipermail/discussion/attachments/20110513/a3d0abb9/attachment-0002.png>