[Users] Re: Re: MediaProxy & PSTN GW

Klaus Darilion klaus.mailinglists at pernau.at
Sat Aug 20 23:03:59 CEST 2005


That does not help you - inserting another hop can not compensate the 
bottleneck between the UAs and the Internet (the ADSL connection).

BTW: 600km is not far away. Which Codec you you use? Try low-babdwidth 
codecs like G729, ilbc, GSM and G723

klaus

Ozan Blotter wrote:
> Dear Iqbal and Bogdan,
> 
> That is exactly what i need to improve QoS, because the UAs ADSL
> connection is not fast enough, 512/128k in general, OpenSER and UA's are
> located in same city but PSTN GW is nearly 600 km (350 miles nearly) away
> from this point. I thought since OpenSER is on a good connection (1Mbit
> Fiber) and can relay to PSTN faster then UA's themselves.
> 
> Thanks,
> Ozan
> 
> Also in terms of ping times how far is the PSTN gateway, as Bogdan said,
> media proxy will add even more delay, as for sending pstn via
> mediaproxy, you could do all yourprocessing, and once ser detects that
> call must goto PSTN, then do all the NAT checking ...this is a
> oversimplified view...
> 
> Iqbal
> 
> Bogdan-Andrei Iancu wrote:
> 
> 
>>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.
>>
>>regards,
>>bogdan
>>
>>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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> 
> 
> 
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