Hi Everyone,
I am trying to add DMQ for redundancy of registrations and USRLOC, and I’m
trying to send calls to the correct SBC that is the original registrar for a
handset. I’ve been using the thread here where Charles gave some guidance on
how to use path to store and use the original SBC:
https://lists.kamailio.org/pipermail/sr-users/2018-February/100246.html and
https://lists.kamailio.org/pipermail/sr-users/2013-September/079736.html
I am struggling with when to decide to modify the destination URI. My testing
shows this is required otherwise some handsets will ignore the invite, but
right now I am doing it in a blanket form, right before SIPOUT (which is where
the origin SBC handles the invite instead of LOCATION). I am sure this is being
too heavy-handed though and there are some cases where I won’t want to set
this, but I am not sure which?
# record routing for dialog forming requests (in case they are routed)
# - remove preloaded route headers
remove_hf("Route");
if (is_method("INVITE|SUBSCRIBE")) {
record_route();
}
…
xlog("Setting du according to path. Current du is $du\n");
xlog("Current route header: $(hdr(Route))\n");
xlog("Current route: $(hdr(Route){uri.host})\n");
>>> $du = $(hdr(Route){param.value,received});
#xlog("New du destination uri is: $du\n");
# dispatch requests to foreign domains
route(SIPOUT);
In the linked threads, Charles mentioned that only the last-hop registrar
should make this change, but what’s the best way to determine if I am on the
last-hop registrar?
As per the snippet above, I tried using the {uri.host} transformation to
extract the origin SBC’s IP from the route header. My plan is to then compare
this against “myself” but I am struggling to extract the right info from the
route header. And I am not even sure if this is the right general approach?
The route header looks like this:
<sip:ORIGIN_SBC_IP:5060;received=sip:UAC_WAN_IP:2048;lr>
Any guidance or examples would be appreciated.
Thanks!
Rhys Hanrahan | Chief Information Officer
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