IP phones on VPN using cable modems 2

[mike212]

We have setup a few users at home and gave them 4612 ip phones. we built VPN's with inexpensive VPN routers, on Comcast cable. Problem is they are not happy with the voice quality, and I noticed ping times do jump somewhat from time to time over the cable. I can't get the cable company to recognise and fix the ping times. My question is; Is there any settings within the Definity, or the phone to clean-up the quality of the voice? The routers don't seem to have any settings to tweek.

 

[RTMCKEE]

maybe try a lower bandwidth codec? The latency on the cable modem, and VPN will give you fits no matter what you do. A lower bandwidth codec will use a smaller amount of the line, but the audio quality will suffer.

RTMCKEE

CM 2.1.1
Prologix R9.05
Modular Messaging 1.1

 

[mike212]

Can you explain how to change the Codec? Thanks!!

 

[NX01]

Make sure you input the users VPN IP range in the ip-network map. Be sure to port forward on the vpn router 1719 UDP, 1720 TCP and the UDP range list in the above IP's network region. Since there is no QOS on the Internet and cable is notorious for high latency, you may need to change routers. Look at the Linksys WRT54G. There is 3rd party firmware that will allow for a vpn client and qos behind the router. i.e. you can allocate specific bandwidth to the ip hardphone. I have had issues with cable users in the past. A few have switched to DSL with much improvement.

In the future everything will work...

 

[RTMCKEE]

cha-ip-code-set

Is where you set the actual codec. you apply the codeset\codec

at cha ip-network-region

Then when you put something in "location xyz" that give the the correct codec when calling other locations.

Do you have the IP phones set to thier own location?

RTMCKEE

CM 2.1.1
Prologix R9.05
Modular Messaging 1.1

 

[mike212]

Yes, The phones IP address is set to the local LAN.

 

[NX01]

Another trick to to turn IP Shuffling off on the ip-network region. Since the ip's are set to the LAN subnet, this will force all your ip phones to rely on the medpro. That may cause a overload. I set up a seperate subnet for my ip hardphones via vpn. This allows me to keep my LAN ip-network region optimized and the vpn ip-network-region customized to the load.

In the future everything will work...

 

[mike212]

THANKS!! What would be the most optimal codec setting in the cha ip-code-set for cable modem?

 

[NX01]

Regardless of what type of connection, cable or dsl, you would want G.711MU, G.729, G.729A, G.723-6.3K. Then remove the codecs from top to bottom to find the one that works best. You will also be removing the codecs from the LAN IP Hardphones unless you split the remote ip's off to a seperate Network region....

In the future everything will work...

 

[mike212]

YOU ARE THE BEST! ! !