[SIPForum-discussion] PSTN calls becomes silent

[Victor Pascual Ávila]

Hello,

On 29/10/2007, test <test at iphonet.net> wrote:
>  I noticed that many times (2/4 calls) where an intern PBX is, the line
> becomes silent during the call, after 6-10 seconds. The called person has a
> busy signal and the caller doesn't hear anything.
>  Has anybody idea why?

Is the extension behind a NAT? are you using any nat-traversal system?

If possible, attach a ngrep trace at pbx side.

Regards,
Victor Pascual