[Users] MediaProxy & PSTN

Bogdan-Andrei Iancu bogdan at voice-system.ro
Fri Aug 19 17:35:17 CEST 2005

Hi Ozan,

so, if I get it right, you have a PSTN gw locate far away from the 
UAs...and instead of letting the media traffic to do directly between GW 
and UAs, you want to insert in the middle a RTP relay (mediaproxy) in 
order to improve the QoS, right?
If so, I would say this will not help you -  having a media relay on 
your media path leads to QoS degradation due additional delays....

If you still want to go for it....I will take a look on tour script.


Ozan Blotter wrote:

> Dear List,
> At below config. i setted up OpenSER on Public IP and PSTN Gateway is 
> again on another Public IP. I use Zyxel Prestige Series 660-HW ADSL 
> modems on both client side and note that they have SIP ALG, also i've 
> completed port forwarding in each modem, so SIP2SIP call happens 
> (voice traffic goes from UA to UA) without need of anything extra as 
> STUN or RTP RELAY. But since those are very away from each other if a 
> UA needs to call PSTN the voice traffic flows from UA to PSTN and that 
> lowers QoS :(
> I would like to activate MediaProxy again but just for one case which 
> is PSTN, so whenever a UA needs to call PSTN the voice traffic flows 
> like :
> UA (ATA) >>> OpenSER + MediaProxy >>> PSTN
> How can i setup this like above without touching SIP2SIP calls between 
> UA's...
> or adding the lines beginning with # these to my existing config is 
> enough ?
> Thanks,
> Ozan Blotter

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