T38G Continues to ring after outbound call connects

[srcurtis]

Hi

I'm not sure if this is phone specific as most of our phones are T38G's.

When calling a remote party from a T38G (via asterisk) over public WAN we often experience connection difficulties. I would estimate 40% of the time. Sometimes the problem can not present itself for a week or so and then reappears.

The problem is with remote phones calling into the asterisk server / T38G phones.

When a call is placed from the remote phone into the office and the call is answered, the remote calling party hears speech but the phone continues to 'ring', i.e. the remote party still hears ring tone in the ear and the phone continues to show the animated arrows typically seen when calling.

Phones are running firmware 38.70.0.172 as we make use of multicast IP and I cannot be sure if there is any updated firmware available that supports this.

Any help would be much appreciated.

Thanks

Steve