[SR-Users] New functionality LCR + force_send_socket() - sanity check

[Geoffrey Mina]

OK, couple more questions regarding my two options.  So far I can
potentially use to_gw_grp("1") OR I can use the flags AVP to store a flag
which dictates what my send_socket will be.  Here are my challenges with
each:

1 - to_gw_grp("1").  How would I ensure that subsequent in-dialog requests
are sent from the same socket as the original INVITE to my ITSP.

Asterisk --> INVITE --> KAMAILIO -->
(next_gw()/to_gw_grp("1")/force_send_socket() --> INVITE --> ITSP
Asterisk --> BYE --> KAMAILIO --> (if(loose_route(){t_relay();}) -- BYE -->
ITSP

How would I call the to_gw_grp("1") in this scenario?  Would I just call it
after calling loose_route(), but before calling t_relay()?


2 - using AVP flags.  The AVP is only set after the initial call to
next_gw(), how would I have access to this flag for in-dialog requests?  I
could perhaps store it in a htable with call-id as the key and overwrite the
value each time we call next_gw() (in the event there are failures)... just
not sure this is the best idea.

Thanks to everyone for your time and effort here.

Much appreciated!

-Geoff


On Fri, Jun 25, 2010 at 7:45 PM, Iñaki Baz Castillo <ibc at aliax.net> wrote:

> 2010/6/25 Geoffrey Mina <geoffreymina at gmail.com>:
> > OK, I am running into some errors when starting my script:
> >
> > if(to_gw("1")){
> >     force_send_socket(X.X.X.180:5060);
> > }else if(to_gw("3")){
> >     force_send_socket(X.X.X.179:5060);
> > }else if(to_gw("4")){
> >     force_send_socket(X.X.X.189:5060);
> > }
> >
> > Jun 25 16:45:14 atl-sipgateway1 /usr/local/sbin/kamailio[15942]:
> > ERROR:core:pv_parse_spec: bad parameters
> > Jun 25 16:45:14 atl-sipgateway1 /usr/local/sbin/kamailio[15942]:
> > ERROR:core:fixup_pvar: parsing of pseudo variable 1 failed!
> > Jun 25 16:45:14 atl-sipgateway1 /usr/local/sbin/kamailio[15942]:
> > ERROR:core:fix_actions: fixing failed (code=-1) at cfg line 348
> > Jun 25 16:45:14 atl-sipgateway1 /usr/local/sbin/kamailio[15942]:
> > CRITICAL:core:fix_expr: fix_actions error
> > Jun 25 16:45:14 atl-sipgateway1 /usr/local/sbin/kamailio[15942]:
> > ERROR:core:main: failed to fix configuration with err code -1
> >
> >
> > Perhaps I an confused about how the to_gw() function of the LCR module is
> to
> > be used.  In my "gw" table, I have gateways with grp_id 1, 3, and 4.  I
> am
> > assuming that is the value I should be checking for in the to_gw()
> function,
> > but it seems to be expecting a pseudo variable or something.
>
> Theorically (according to the LCR documentation), "to_gw()" must be
> used when processing in-dialog requests. However I'm not sure of the
> cause of your error, which is exactly the line 384 in your script?
>
> Anyhow I suggest you a different approach:
>
> - Set a different flag for each gw (in LCR 'gw' table) depending on
> the sending socket that must be used.
> - After calling 'next_gw()' inspect the value of the gw flags (stored
> in a configured AVP) and choose which 'force_send_socket()' to use.
>
>
> --
> Iñaki Baz Castillo
> <ibc at aliax.net>
>
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