asterisk users - Jan 2011 - Ghost ringing

We are having the strangest issue that I have seen for some time. A
customer of ours with Polycom phones (4x ip335, 2x ip550) will
occasionally (maybe 1 in 50 calls) hear ringing on the line along with the
other party. It has happened on both incoming and outgoing calls across
apparently all of the phones. We use ip550 in our office with Asterisk and
have never had such a problem (we run the same firmware as well, although
their hardware is newer). It can be fixed if the person using the phone
puts the other person on hold and then takes them off hold. They have just
been doing this by double pressing hold so the other party doesn't even
realize it. Everything is connected to an on-net Asterisk box. We have
sniffed SIP traffic and haven't found anything out of the ordinary, in
fact, the RTP data doesn't appear to contain the ringing even though it is
audible on the phone.

Any thoughts? Anyone ever experience any similar issues?

Thanks much in advance,
Joe

I had this reported, but it has nothing to do with Asterisk (as far as I
could tell). The Polycom firmware (3.3.x) was the problem.  I don`t remember
if it was 3.3.1 or 3.3.0, but if you`re running one of those try the other.
It helped me, I haven`t had the complaint since.

Mike

-----Original Message-----
From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of
jfratantoni at iswan.net
Sent: Friday, January 14, 2011 12:58 PM
To: asterisk-users at lists.digium.com
Subject: Re: [asterisk-users] Ghost ringing

We are having the strangest issue that I have seen for some time. A customer
of ours with Polycom phones (4x ip335, 2x ip550) will occasionally (maybe 1
in 50 calls) hear ringing on the line along with the other party. It has
happened on both incoming and outgoing calls across apparently all of the
phones. We use ip550 in our office with Asterisk and have never had such a
problem (we run the same firmware as well, although their hardware is
newer). It can be fixed if the person using the phone puts the other person
on hold and then takes them off hold. They have just been doing this by
double pressing hold so the other party doesn't even realize it. Everything
is connected to an on-net Asterisk box. We have sniffed SIP traffic and
haven't found anything out of the ordinary, in fact, the RTP data
doesn't
appear to contain the ringing even though it is audible on the phone.

Any thoughts? Anyone ever experience any similar issues?

Thanks much in advance,
Joe


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