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

[Olivier]

As using OPTIONS requests main benefit is to non-phone specific, what shall
we do when most vendors do not comply with RFC ?

2008/1/9, Raj Jain <rj2807 at gmail.com>:
>
> 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)
>
>
>
>
>
>
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