How to connect to China? 1

[4650]

We are planning on oppening an office in China. At the moment we have 412 in central office and would like to use 406 in China with the local VM lite. We will have 10 VCM module in 406. Also, 406 will have local PRI so we can build a route and when making calls in China from local office in US, it will pick up the China PRI so we can save on longdistance calls. The connection will be via VPN (CISCO PIX to PIX). Ping time is from 200ms to 300ms at this moment with out the tunnel. Would this solution even work and how well? If not, what is the sugestion on how to make this work.

Thanks in advance, George

 

[sizbut]

Couple of points:

1) The 412 will need a VCM as well.

2) The current PING delay is on the edge of what would be acceptable. The maximum delay acceptable varies depending on which audio codec the IP trunk is configured for.

The maximum PING times are G711:260ms, G723:140ms and G729:220ms. Above those times, the latency effect becomes audible and annoying to most people.

 

[SuperJenks]

Well, my experience with using a vpn through the internet has not been pleasant. I have 3 different customers using this type of application and I dont think it works good unless you have a dedicated connection from the ISP. In my opinion 200 ms will not support good voice quality. Even if you are running compresion on the voice packets, I have found this doenst work unless they have atleast a 1.5mb upload and download speed(Standard T-1 Speed). The Hops it must take from I'm assuming from the U.S. to China must be emense and very unpredictable. The Only customer that I have now where this works well is a 403 and a 406 Small community networked with both having a dedicated 10mb pipe at both sites using the same provider so the traffic never hits the internet. It works flawless. It all boils down to bandwidth and the amount of hops it takes to reach its destination...

 

[SuperJenks]

Just wanted to add one more thing.. I would recommend a Point to Point dedicated T-1 for your application. The only catch is the cost... The internet is free. The Point to Point would probably cost you in the realm of $600 to $800 at each site possibly depending on location and provider.

 

[avayaconsultant]

We have several users that remote from home on Pix devices. First, there are several things to ensure on both ends of the tunnel. The Pix will need to be configured properly. We had a VPN tunnel just like between California(DSL connection) and North Carolina(T1). We used Avaya IP Phones in the CA office linking to an IPO in NC. Things worked great. You will need to see what you can do in order to reduce your ping response. This is fairly critical to the whole environment. Then, I would monitor that for a while to ensure that the link is staying up and reading consistent response times. I believe that the idea and concept is a great cost effective solution. The IPO does pretty good with Least Cost routing if it is configured right to start with. Let me know if there is anything I can help with.

C

 

[IPOfficeGuru]

Your ping times are way off from ebing acceptable
Plus the overhead of the VPN encryption and busy days on the internet will only add to delay.
Acceptable delays are <80ms, anything more and you're playing with fire.