[Asterisk-Users] Unexpected ISDN hangup on outbound call

[Stephen Davies]

On Wed, 7 Jan 2004, Sjur Eivind Usken wrote:

> We have setup an asterisk box to let everybody call into the university 
> internal network, but I get unexpected hangups when doing an outbound call 
> from SIP to the ISDN interface, and it happens from 20 seconds to some minutes into the 
> call.
> 
> ----------the dial and the problem-----------
>     -- Executing Dial("SIP/57966-a19d", "Modem/g1:96121||rt|") in new 
> stack
>     -- Executing Dial("SIP/57966-a19d", "Modem/g1:96121||rt|") in new 
> stack
>     -- Called g1:96121
>     -- Called g1:96121
>     -- Modem[i4l]/ttyI1 answered SIP/57966-a19d
>     -- Modem[i4l]/ttyI1 answered SIP/57966-a19d
> voipgk*CLI> WARNING[81926]: File chan_sip.c, Line 464 (retrans_pkt): 
> Maximum retries exceeded on call 4d86fdeb31edf97a at 10.0.0.13 for seqno 102 
> (Request)
>     -- Hungup 'Modem[i4l]/ttyI1'
>     -- Hungup 'Modem[i4l]/ttyI1'
> -----------------

As far as Asterisk is concerned, it never finished establishing the
SIP connection from the source phone.

I suggest enabling SIP debug and have a look at the messages.

Perhaps you have a NAT issue.

You may like to dial say the Echo application on your Asterisk server
to satisfy yourself that this isn't an ISDN issue.


Steve