I'm having a similar problem.  I have asterisk transferring calls to my
cell phone if I don't pick up my extension, it works most of the time,
however sometimes no audio comes out from my cell back to the caller.
I've been trying to find a way to determine if it's me or my service
provider, but since all calls that I make/receive with my SIP phone work
100% of the time, I think it's asterisk. 

Does anyone have an idea on how to debug this?

To make troubleshooting harder, I can't replicate the problem on demand,
sometimes it works, sometimes it doesn't.

On Thu, 2007-18-01 at 16:34 -0500, Henry.L.Coleman wrote:
> It may be worth checking the cable(s)
> Henry L.Coleman CEO
> *VoIP-PBX* 1-866-415-5355
> Toronto Ontario
> Canada
> 
> 
> > John,
> >
> > The fact that the audio problems are solved by transferring from one
> > phone to another would indicate to me that it's between the phone, and
> > the Asterisk server.
> > I take it that it's a direct connection through one switch from the
> > phones to the server?
> >
> > I have a client that received fairly heavy call volume, a few hundred
> > calls a day, on IP501's using Static Queues on 1.2.13, and 1.2.14 (as of
> > 2 weeks ago). They have experienced no similar problems, so I can't say
> > "me too".
> >
> > What firmware version are these phones running? We use 2.0.1 with no
> > problems.
> >
> > Can you get a packet dump from the server and see if it's sending the
> > phone data?
> >
> > Chad
> >
> >
> >
> > -----Original Message-----
> > From: John Van Ostrand [mailto:[EMAIL PROTECTED]
> > Sent: January 17, 2007 6:41 PM
> > To: [email protected]
> > Subject: [on-asterisk] No audio on some calls
> >
> > This is one that we've been fighting for a while.
> >
> > We have a small install (8 extensions) using [EMAIL PROTECTED] with Polycom 
> > 501 SIP
> > phones. Every once and a while one side of an incoming call's audio is
> > missing. The callers can hear the employee but the employee can't hear
> > the caller. They have been able to handle it in the past by transferring
> > the call to another extension.
> >
> > To make this worse, it seems to only be occurring with two phones. We've
> > replaced the phones three times and the report from the customer is that
> > it fixed it, then a week or so later we hear that it's back.
> >
> > More oddities, is now they say they've had it occur  on an outgoing call
> > too.
> >
> > The two phones that it is occurring are in a static queue and most of
> > the calls they will receive are from the queue.
> >
> > The reports from this customer are pretty sketchy, but they have been
> > insistent about the audio problems.
> >
> > Any ideas.
> >
> > --
> > John Van Ostrand                       Net Direct Inc.
> > CTO, co-CEO                   564 Weber St. N. Unit 12
> >                                   Waterloo, ON N2L 5C6
> > [EMAIL PROTECTED]                     ph: 518-883-1172 x5102
> > Linux Solutions / IBM Hardware        fx: 519-883-8533
> >
> >
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