CODEC Question 1

[Nortel4Ever]

One of our customers is a school board. They have a black box at the board office that connects to the Telco with multiple PRI trunks and provides SIP trunks to 500V2 10.1 at the schools. Codec for the SIP trunks is g.711. The 9608s at each school were set at g.711 too but for some reason the audio quality was poor. Wireshark traces with playback of the audio had no issues right up to the phone but the audio at the phone was bad.
One of the techs tried setting a phone to g.729 and the audio improved greatly. They are now wondering why the audio improved with the different codecs. I told them that the IPO does the translation and to be happy it's fixed but they want a better explanation than that.

 

[joe2938]

sounds like the pipe does not have enough bandwidth so it needs to be compressed going across the network

 

[Westi]

729 sounding better than 711 is nasty.
Is the 711 uLaw or aLaw?
if they don't match you may get some issues.

Joe W.

FHandw, ACSS (SME)


"This is the end of the world, make sure to buy your T-shirt before it is too late"
Original expression of my daughter

 

[DaIPOTek]

This is one of those where you get to smile and say, "Your network bandwidth is insufficient or improperly configured. We adjusted our end to use a higher compression codec to compensate for your network".

 

[joe2938]

exactly lol