[asterisk-users] Full Duplex

Matt Riddell lists at venturevoip.com
Thu Nov 20 18:32:31 CST 2008

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?

Kind Regards,

Matt Riddell

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