G.711 A-LAW over ADSL.....

[mytelecoms]

I know, I know, it's not meant to be done!!

However, I have tried it and seems to work great.

Our client has 288Kbps upstream, 512kpbs down at one remote site. Now, G711 should use about 80-90Kbps as far as I know, whereas the usual WAN codec (G729a) uses about 20-30Kbps, right?

This ADSL connection is contended at 40:1 as well. Eventually, all remote sites will become 20:1. Head Office is 1Mbps Megastream (T1 for you guys over the pond).

When we had it on G711, we also has an RDP session running across the same link, and we were using a Draytek to provide Qos for voice over data. The quality of the voice was unbelievable.

Has anyone had experience of running G711 over ADSL for long periods of time? I had a 20 minute call going and it was perfect.

We're back on G729(a) for now, until their customers mention it as being an issue, but it would be nice to know that we could actually run G711 over ADSL effectively.

Thanks for your thoughts!

 

[JeSTeROCK]

I run G711 pm soft phone with no probs over pptp soft vpn on 2 1500/256k adsl connections, 1 being user type adsl and the other business grade 20/1 with no issues. G711 makes the calls sound a lot better. i've found alcatel ip pimphony to be the best though, as in sound quality.

g729 should be used with more than 1 or 2 trunks though.

 

[mytelecoms]

Thanks for the feedback. I may just turn it on and see how things go. Each ADSL site only has one IP phone anyway. Told the client under no circumstances should they have anymore without moving away from ADSL.