no dial tone on ip phones

[nortelgeek]

I have a bcm 400 4.0 and when the customer presses intercom there is no dial tone but can still dial. I have seen this on other bcms but never was a problem. Can anyone tell me why this is happing and how to fix it? By the way my patches are up to date.

 

[MagnaRGP]

Networking issues.

You need to provide WAAAY more info for a better diagnosis than that:

Set type and location (local LAN/remote)
How connected if remote

Network topology (physical as well as logical)

Example of ip set provisioning

Post all that, and the answer will most likely become apparent.

 

[nortelgeek]

Its an i2004 there is a site to site vpn with static ips on each 172.16.2.2xx on one side and 192.168.100.xx on the other. ports 51000 - 51200, 28000 - 28255 udp are open. dont know what else is needed.

 

[MagnaRGP]

If you are using a proper VPN, you don't need to open ports as both sides are on the private side of a firewall.

Are the tunnels allowing all traffic? Have any protocols been blocked across the tunnels? I'm suspecting some are being blocked, specifically UDP.

 

[bigcat919]

Don't know why it happens but I've seen it twice at the same place. Go into maintenance, disable the ext., then re-enable it. Has worked for me both times.