[asterisk-users] Full Duplex

[Matthew Fredrickson]

Matt Riddell wrote:
> On 18/11/2008 9:46 a.m., Matthew Fredrickson wrote:
>> Singer X.J. Wang wrote:
>>> We've had the same issue. For calls that go between a SIP connection 
>>> (desktop phones) and Zaptel connections, there was a lot of problems 
>>> with half duplex. We switched
>>> from the Digium card to the Sangoma card and the problem went away.
>> Just for the record, he said that it happened regardless of protocol (IP 
>> to IP calls do not use the card based echo cancellers).
>>
>> Sorry for the problem you had.  However, I think that if you use a 
>> current version of our echo canceller board, you will find your issues 
>> resolved.  In fact, for a significant number of Digium's boards, Sangoma 
>> uses the exact same hardware echo canceller.
> 
> A few months ago, I had a similar problem and needed to pass:
> 
> vpmnlptype=4 vpmnlpmaxsupp=11
> 
> to resolve it. If I upgraded zaptel would this be fixed?

In a newer version of the firmware, it's very likely, although you would 
have to talk to technical support directly about it right now to get the 
updated version.

Matthew Fredrickson
Digium, Inc.