[Asterisk-Users] Help - is voip good for in-house calls?

[Peter Svensson]

On Sun, 15 Aug 2004, Francis Augusto Medeiros wrote:

> Is this small delay annoying enough? Can it be perceived by the part
> at the pstn side? Does it disturb fax signals, for example?

The echo described by Tobias (originating at the pstn connected user) 
should only affect the isdn connected part in the scenario above. Whether 
the echo from the pstn is audioable to the voip user depends on the 
latency introduced.

Fax machines and modems already handle echo and long delays themselves. In 
fact, an echo canceling or echo supressing device should disable itself 
when hearing the guard tone (2.1kHz?). It is only annoying to humans.

Peter