[Serusers] t.38 fax woes

[Klaus Darilion]

1. Your calling UA behaves wrong - the ACK must be sent to the proxy 
(record route), not directly to the other UA.

2. increase the log level and watch the sylog output - ser should tell 
you if there is a problem with the INVITE message. Do you have a 
loose-route() block in your ser.cfg?

regards,
klaus

bert berlin wrote:

>   HI,
> 
> WE are having problems with t.38 fax and record-route in SER.
> 
> Without record_route, using only t_relay(), fax works fine between two 
> of our UA's.
> 
> However, when record_route is used, a voice call is successful but a fax 
> call fails.  An ethereal sniff shows that the "re-invite" from the 
> destination to the origination is never forwarded to the origination 
> UA.  Thus, the fax fails.
> 
> If I turn off record_route(), the fax call succeeds.
> 
> An ethereal sniff of the failure case is attached. A snip of the ser.cfg 
> file which shows the use of record_route() and t_relay() is attached.  
> If I comment out the one line for record_route(), the fax succeeds.
> 
> Any ideas as to why this fails?
> 
> thanks
> bert
> -- 
> 
> Bert Berlin
> 
> Director, System Test
> Quintum Technologies, Inc.
> 71 James Way
> Eatontown,NJ 07724
> ph 732-460-9000 ext 247
> 
> 
> ------------------------------------------------------------------------
> 
>        if (uri==myself)
>         {
> #look for the registered contact in the location table of database      
> #and if find it, rewrite the uri and forward statefully to the destination
>         if (lookup ("location"))
>         {
>                 record_route();#send everything back through the proxy
>                 t_relay();
>                 break;
>         }
> 
> 
> 
> ------------------------------------------------------------------------
> 
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