[Asterisk-Users] Sipura SPA-841 and firewall

[Wilson Pickett]

This old post just saved my nerves! Please remember to post solutions
when you find them as this person did.

SPA-941, swapping in a D-Link switch and DSL modem to replace a
Linksys WAG54-G. This router is notorious for suddently losing the
ability to negotiate bit rates (thanks again, Google).

Upon replacement of the Linksys, everything worked fine except audio
on the Sipura. Turns out you need Symmetric RTP turned on in the phone
as Chris Mason says below.

On 4/29/05, Chris Mason (Lists) <lists at masonc.com> wrote:
> Just for future reference, I found the answer - I enabled Symmetric RTP: on
> the Advanced SIP page.
>
> Chris Mason
> www.anguillaguide.com
>
>
> > -----Original Message-----
> > From: asterisk-users-bounces at lists.digium.com
> > [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of
> > Chris Mason (Lists)
> > Sent: Thursday, April 28, 2005 6:22 PM
> > To: 'Asterisk Users Mailing List - Non-Commercial Discussion'
> > Subject: [Asterisk-Users] Sipura SPA-841 and firewall
> >
> > I have an asterisk server and 4 Sipura phones behind a
> > Linksys WRT54G router. I have set the DMZ to the Asterisk
> > server's IP so that it can be seen from outside. I have a
> > Sipura SPA-841 phone outside the router and set to proxy to
> > the public IP of the router. The outside phone registers
> > fine, dials fine, and I can hear the person speaking from
> > inside the router, but I cannot be heard.
> >
> > Is there any explanation for this? Surely the DMZ allows all
> > traffic to the PBX?
> > This is driving me nuts.
> >
> > Chris Mason
> >
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> >
>
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