[Asterisk-Users] Codec negotation with re-invites..

[Alex Volkov]

Sounds to me that your asterisk first negotiates g729 with your phone, then
negotiates ulaw with the gateway (since it *is* the preferred codec in your
config), and on a re-invite the logic breaks up either in the phone or in
the gateway (or perhaps in the asterisk itself, I am not absolutely clear on
the details of re-invites). Try changing the order of codec preference for
the gateway and see if that fixes your g729 phone and breaks the ulaw phone
at the same time.

Alex.

----- Original Message -----
From: "Billy Huddleston" <billy at nxs.net>
To: <asterisk-users at lists.digium.com>
Sent: Friday, March 12, 2004 2:02 PM
Subject: [Asterisk-Users] Codec negotation with re-invites..


> I'm about over this.. okay,, here is what I got..
>
> [general]
> port = 5060                     ; Port to bind to
> bindaddr = 0.0.0.0              ; Address to bind to
> context = inbound                       ; Default for incoming calls
> tos=lowdelay
> tos=184
> disallow=all                    ; Disallow all codecs
> allow=ulaw
>
> [gateway]
> type=friend
> host=1.1.6.9
> canreinvite=yes
> qualify=yes
> dtmfmode=rfc2833
> context=default
> disallow=all
> allow=ulaw
> allow=g729
>
> [sipphoneg729]
> type=friend
> secret=password
> nat=yes
> host=dynamic
> canreinvite=yes
> qualify=200
> context=longdistance-g729
> dtmfmode=rfc2833
> mailbox=2199
> disallow=all
> allow=g729
>
> [sipphoneulaw]
> type=friend
> secret=password
> nat=yes
> host=dynamic
> canreinvite=yes
> qualify=200
> context=longdistance
> dtmfmode=rfc2833
> mailbox=2199
> disallow=all
> allow=ulaw
>
>
> okay, when I place a call from sipphoneulaw to the outside world via
> gateway, everything works fine..
> If I place a call from sipphoneg729, it doesn't work..  One leg to the
> gateway will be ulaw, the leg to the phone will be g729, and, I have 1 way
> audio.. The sip phone can hear anything from the gateway, but, the gateway
> can't hear the phone.
>
> I've even went as far as to setup a seperate context for the g729 phone
and
> do this..
> ,SetVar,SIP_CODEC=g729  which, says it sets it to g729, but it's still a
> ulaw call..  Guys, this is a real problem... We're going be doing mixed
> configs.. and if a gateway says it can do both, and phone says it can only
> do one... then we should be using the compatable codec...  PLEASE help..
> This is going to cause problems in our rollout.
>
> Thanks, Billy
>
>
>              +--------------------------------------------------+
>              | Billy Huddleston   Senior Systems Administrator  |
>              | Net-Express                  http://www.nxs.net  |
>              | 114 Sherway Rd.             Voice: 865-691-2011  |
>              | Knoxville, TN  37922          Fax: 865-691-9894  |
>              | billy at nxs.net                                    |
>              +--------------------------------------------------+
>
>