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

[Alex Balashov]

Henning Westerholt wrote:
> 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). 

Another possibility is that -- depending on what is on the far side of 
the PSTN gateway (PRI?) -- the ringing is not sent in-band, and the 
appropriate translation of the ISDN progress indicator ("PI") to OOB 
ringing events is not configured?

-- 
Alex Balashov
Evariste Systems
Web    : http://www.evaristesys.com/
Tel    : (+1) (678) 954-0670
Direct : (+1) (678) 954-0671
Mobile : (+1) (706) 338-8599