[Asterisk-Users] Remote employees using Polycom 501 lose ability to receive incoming calls after few minutes.

[Tom Vile]

You have to lower the registration interval in the phones to under a
minute otherwise the NAT hole closes and no calls come in.

Polycom has said that they are going to be putting in a keep alive in
the firmware at some point.

On 6/28/06, Von L. <methodvon at gmail.com> wrote:
> Hello,
>
> Here is a breakdown of the issue I am experiencing. I have three remote
> employees, in various states, who have Polycom 501 phones. They are
> unable to receive incoming calls after a few minutes of the phones being
> plugged in. They work immediately after being plugged in, but they lose
> the ability shortly thereafter. They can always make outbound calls, but
> only to real phone numbers, not extensions.
>
> They each have NAT routers, and I have triple checked that they have
> opened/forwarded the correct ports, basically 5060-30000 UDP. Once they
> plug the phone it (power and ethernet) I see on the CLI console of the
> asterisk server that the phones register:
>
> Asterisk CVS-v1-0-12/01/04-18:46:01, Copyright (C) 1999-2004 Digium.
> Written by Mark Spencer <markster at digium.com>
> =========================================================================
> Connected to Asterisk CVS-v1-0-12/01/04-18:46:01 currently running on
> bell (pid = 3652)
> nell*CLI>
> Verbosity is at least 10
> -- Registered SIP '3015' at XXX.XXX.XXX.XXX port 1500 expires 3600
>
> Here is the top part of my sip.conf
>
> ;_____________________________________________________________
> ;sip.conf
> ;_____________________________________________________________
>
> [general]
> port=5060
> bindaddr=0.0.0.0
> externip=XXX.XXX.XXX.XXX
> localnet=XXX.XXX.XXX.XXX/255.255.255.248
> canreinvite=no
> tos=reliability
> srvlookup=yes
> disallow=all
> allow=ulaw
> dtmfmode=rfc2833
> nat=yes
> ignoreregexpire=yes
>
> I know it has something to do with the NAT because if I plug my Polycom
> directly into my cable modem, thus making it sit on the Internet and
> have a real IP, everything works just fine.
>
> I am curious what I am missing.
>
> Thanks.
>
> Von L.
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-- 
Tom Vile
Baldwin Technology Solutions, Inc
Consulting - Web Design - VoIP Telephony
www.baldwintechsolutions.com
Phone: 518-631-2855 x205
Fax:     518-631-2856