[Serusers] t_uac_dlg() bug ?

[Jiri Kuthan]

Jim,

CTD acts as a SIP client -- i.e., it takes mydomain.com and tries
to resolve it via DNS. If the resolution fails, the transaction 
fails. That's completely orthogonal to function of "alias" which
is used for proxy server's domain matching.

if mydomain.com is served by the same server, CTD initiates a transaction,
sends it to itself, and in proxy mode it recognizes it as a request
for itself using alias.

-jiri

At 04:46 PM 10/30/2003, Jim Burwell wrote:
>Hi,
>
>I was trying to get click-to-dial working from SERweb and it was failing for unclear reasons.  I then experimented with the "ctd.sh" script, which does the same thing as the SERweb PHP code.  I found that it would fail during the 'dummy invite' stage, returning an odd error if I used a URI which used a SIP domain/realm, but would work fine if I used the IP address of the SIP proxy as the domain.  i.e.:
>
>   ./ctd.sh sip:joebob at mydomain.com sip:billybob at mydomain.com   <- fails
>   ./ctd.sh sip:joebob at 1.2.3.4 sip:billybob at mydomain.com        <- succeeds
>
>The reply from SER would be "500 fifo_uac: no mem for hf block" .  The log file would have these errors:
>
>   ERROR: mk_proxy: could not resolve hostname: "mydomain.com"
>   ERROR: uri2proxy: bad host name in URI <sip:joebob at mydomain.com>
>   ERROR: uri2sock: Can't create a dst proxy
>   ERROR: get_hf_block: send_sock failed
>   ERROR: fifo_uac: no mem for hf block
>
>So it appears that SER didn't understand that the URI's domain was itself, even though there's a host alias line in the ser.cfg file listing "mydomain.com" as an alias for this host.  It's as if it thinks it needed to relay the transaction to another SIP router, and look up an IP to do so.  If "mydomain.com" were placed in /etc/hosts as an alias for the system SER was running on, or if a DNS SRV entry for the SIP domain were created pointing to the SER system, voila, the "sip:user at domain" form would work just fine.
>
>Is this a bug ?  I think SER isn't checking SER host aliases against the SIP domain if the SIP request comes in via the fifo t_uac_dlg() command.
>
>I'm using the SER release 0.8.11-r1, aka the "stable CVS" release.
>
>TIA,
>Jim
>
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--
Jiri Kuthan            http://iptel.org/~jiri/