atcomsystems.ca/forum Forums TDM Business Telephone Systems Inter-Tel Telephones & Systems Access 9.x IP phone

I have an IP phone that has a strange problem.
When making or answering a call the link is dead.
Neither side can hear.

Had this problem off an on for a while.
The phone is in the UK and I am in the US so that makes it more fun..

First I went into programming and pointed the phone by MAC address to a diff station so got fresh settings. No difference.

So sent a replacement phone.
Replacement phone is doing it now too.
It works in general, connects gets ext info. Gets dial tone. Can hear the ringing on the handset but once answered -- dead air.

Is there something I can test on the network on the remote side? Verify can telnet IP Ports?
This is the only phone / location I know if having this problem.

Thank you

Usually when you have an audio issue it is because of a double NAT. Put the IP Phone in the UK into a DMZ or directly on the WAN. See if the problem is still there.

I have an IP phone on a DSL in the UK. If the phone is not used for a while, it looses audio. Have the user power cycle the phone. That works for us. I can't prove it, but it seems that the UK DSL connection blocks unused ports. Once the phone is rebooted, the ports are opened again.

We're going to have to keep you guys around. :toast: