ATA 186 MGCP on Wan- Bandwidth and max delay

[superiortel]

CallManager 3.3 in Texas, ATA MGCP on G723 in central europe over VPN. The VPN has a very steady 200Ms trip delay, the pipe in Europe is 64kb up/256kb down, and it's real. Texas has a full T-1 in/out. Can't get any decent connectivity, the audio is all chopped up and sometimes works only 1 way. Anyone has a pointer to maximum delay and bandwidth comsumption ? Thanks to all for a great board.

 

[simonxts]

If I can remember right the maximum delay should not go over 150 ms. Has QoS been installed on the routers? Is there any QoS mechanism in the VPN?

Simon

 

[superiortel]

There's no traffic other than Voice over that Vpn, and, no, there's no Qos. I'm just puzzled because I run VoIP to Quintum routers with the same bandwidth and up to 400ms without any problems.

 

[Conleyjo]

I am running VOIP over VPN to Kosovo, and other places, and it is working great. It really doesnt matter how long the delay is as long as the packets arrive in order. On the Kosovo link, there is a noticable delay, (its a VPN over satellite) but the voice quality is good. I highly recommend IP-Phones instead of ATA devices since the IP phones have internal buffering that will take care of the jitter. The 200ms delay is not an issue.

Questions...
1. Is the phone on the end of the VPN tunnel getting an internal routable IP Addresses from YOUR stateside network?

2. Is the voice quality bad when going out your gateway to the pots network? If so, what gateway are you using.

John

 

[Ru55ell]

Superiortel, I am looking at the Quintum products an am thinking about employeeing their products in my network.

First: I know Quintum has a feature called silence suppression. This conserves bandwidth between the Quintum boxes. I am no expert but thought this might be why you’re getting better quality between the Quintum boxes. Can you employ this technology through the VPN network? One more thing, I just thought of it. Quintum has another feature to route internal addresses with the VoIP packet. Can you or are you doing this on the VPN link? Again, I am hardly an expert or even a novice.

Second: How do you like the Quintum products. Are they reliable? Again I am doing product research for my company.