[asterisk-users] How to check if a SIP phone is forwardedwithout ringing it ?

[Raj Jain]

This issue of phone vendors not supporting OPTIONS according to RFC 3261
often comes up on this list. Like Kevin Fleming said, an OPTIONS request is
supposed to be responded in the same way as an INVITE. Almost all SIP phone
vendors have construed OPTIONS as some kind of a keep-alive request, which
is wrong. 

Can we ask the phone vendors to play by the book?
 
--
Raj
 

________________________________

	From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Olivier
	Sent: Tuesday, January 08, 2008 7:50 AM
	To: Asterisk Users Mailing List - Non-Commercial Discussion
	Subject: Re: [asterisk-users] How to check if a SIP phone is
forwardedwithout ringing it ?
	
	
	2008/1/7, Kevin P. Fleming <kpfleming at digium.com>: 
	
		Olivier wrote:
		
		> Is there way for an Asterisk server to check if a sip
phone is forwarded
		> without bothering phone's user ?
		
		No.
		
		> I was thinking of some Alert-Info option that would let
the phone reply 
		> with a 302 Moved Temporarily or 182 Queued message and not
let the phone
		> ring or display anything on its screen.
		
		According to the SIP RFC, a SIP endpoint is supposed to
respond to an
		OPTIONS message the same way that it would respond to an
INVITE message 
		with the identical destination, but I've never seen a phone
respond to
		an OPTIONS message with anything but '200 OK', even when a
redirect
		(forward) is in place.

	
	So, the alternative option is to play with html and use phone
embedded html server to get this redirection data. 
	
	Cheers
	


		--
		Kevin P. Fleming
		Director of Software Technologies
		Digium, Inc. - "The Genuine Asterisk Experience" (TM)