[Kamailio-Users] [OpenSER-Users] Polycom Phones produce no wringing when dialing pots lines on the pstn

[Henning Westerholt]

On Friday 25 July 2008, Alex G wrote:
> I'm sure i'm not the first to experience this. My polycom phones when
> calling out a pstn gateway recieve far end ringing when dialing cellphones
> in the US, but when i try to call a pots line i get no ringing, only
> silence until the end point answers the call.
>
> Any insight or help would be very appreciated. I have sip captures that i
> can post, but opted not to incase someone has seen this and knows the
> answer first.

Hi Alex,

perhaps the PSTN gateway or your polycom don't support early media? Check if 
RTP is flowing in the "silent" case before the call is finally established 
(with 200 OK). 

Cheers,

Henning