Hello Terry,
  thank you for your answer.

2011/10/19 Terry Wilson <[email protected]>

> If I had to guess, I'd say that you don't have canreinvite/directmedia=no
> in sip.conf and there is possibly a NAT between the phones and Asterisk.
> When they have the same codec and directmedia is enabled, the phones will
> try to communicate directly to each other. It sounds like it is taking a
> while for firewalls to allow this traffic through (since both phones have to
> send packets out to the other before the whole is opened up in many setups).
> When the codecs are forced to be different, the media will go through
> Asterisk to get to the phones instead, alleviating your issue.
>

 I have canreinvite and directmedia to 'no' - and there is no NAT between
the phones and asterisk...

thanks.

bye,
stefano
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