[SR-Users] Routing calls to a subscribed softphone

[Will Ferrer]

Hi

I was wondering if any one had any advice or examples for me of how to get
a call to be routed to a subscribed softphone.

We have 2 boxes in our testing deployment, a load balancer / sbc and a call
processing box.

Calls come in to the sbc, and then are passed to the call processing box.
The call is analyzed and the branch uri is rewritten to a destination
address when applicable for the call (this is how we handle routing of
calls to certain numbers -- we do this utilizing custom code and a custom
db).

This works just fine when the destination sip uri is phone number (in which
case we do lcr) or if the destination goes to a remote address.

However when the destination is a subscriber:
sip:[subscriber_name]@[our_domain_name], the call is passed back to the
sbc, which passes it to the callprocessing box, back and forth until a too
many hops error occurs.

The subscriber I am trying to send the call too does show up under "kamctl
ul show".

I feel like there is something basic I must be missing here.

Does any one have any advice for me?

Thank you very much in advance.

All the best.

Will Ferrer

[Paul Smith]

Hi Will,
It sounds like your kamailio.cfg is not looking up the user location
database before trying to relay the INVITE. There is a relevant section
in the kamailio-basic.cfg example configuration file:


request_route {
...

# user location service
route(LOCATION);
}

...

# USER location service
route[LOCATION] {
if (!lookup("location")) {
$var(rc) = $rc;
t_newtran();
switch ($var(rc)) {
case -1:
case -3:
send_reply("404", "Not Found");
exit;
case -2:
send_reply("405", "Method Not Allowed");
exit;
}
}

# when routing via usrloc, log the missed calls also
if (is_method("INVITE")) {
setflag(FLT_ACCMISSED);
}

route(RELAY);
exit;
}


The logic is that if the call is for a local registered user whose
location is available in the "kamctl ul" then request_route() should
pass the request to the route(LOCATION) routine. The function call
lookup("location") then does the magic if matching the address of record
([subscriber_name]@[our_domain_name]) and returning the $ruri of the
registered phone ([realid]@[realip]). route(RELAY) is then able to send
the call on to the phone's actual IP address.

Hope that helps.

Paul Smith

Post by Will Ferrer
Hi
I was wondering if any one had any advice or examples for me of how to
get a call to be routed to a subscribed softphone.
We have 2 boxes in our testing deployment, a load balancer / sbc and a
call processing box.
Calls come in to the sbc, and then are passed to the call processing
box. The call is analyzed and the branch uri is rewritten to a
destination address when applicable for the call (this is how we
handle routing of calls to certain numbers -- we do this utilizing
custom code and a custom db).
This works just fine when the destination sip uri is phone number (in
which case we do lcr) or if the destination goes to a remote address.
the sbc, which passes it to the callprocessing box, back and forth
until a too many hops error occurs.
The subscriber I am trying to send the call too does show up under
"kamctl ul show".
I feel like there is something basic I must be missing here.
Does any one have any advice for me?
Thank you very much in advance.
All the best.
Will Ferrer
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

[Will Ferrer]

Hi Paul

Thank you very much for the quick response and the probably spot on information. I really bet that is my issue.

I will be testing this out tonight and I will post back with what I find.

Thanks again and all the best

Will Ferrer

Post by Paul Smith
Hi Will,
request_route {
...
# user location service
route(LOCATION);
}
...
# USER location service
route[LOCATION] {
if (!lookup("location")) {
$var(rc) = $rc;
t_newtran();
switch ($var(rc)) {
send_reply("404", "Not Found");
exit;
send_reply("405", "Method Not Allowed");
exit;
}
}
# when routing via usrloc, log the missed calls also
if (is_method("INVITE")) {
setflag(FLT_ACCMISSED);
}
route(RELAY);
exit;
}
Hope that helps.
Paul Smith

Hi
I was wondering if any one had any advice or examples for me of how to get a call to be routed to a subscribed softphone.
We have 2 boxes in our testing deployment, a load balancer / sbc and a call processing box.
Calls come in to the sbc, and then are passed to the call processing box. The call is analyzed and the branch uri is rewritten to a destination address when applicable for the call (this is how we handle routing of calls to certain numbers -- we do this utilizing custom code and a custom db).
This works just fine when the destination sip uri is phone number (in which case we do lcr) or if the destination goes to a remote address.
The subscriber I am trying to send the call too does show up under "kamctl ul show".
I feel like there is something basic I must be missing here.
Does any one have any advice for me?
Thank you very much in advance.
All the best.
Will Ferrer
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

[Will Ferrer]

Hi Paul

Just wanted to give you an update.

This looks like it has worked. Now I am dealing with my own natting issues
on my home network to get the call but the invites are being sent right now.

Thanks again for the assistance.

All the best.

Will Ferrer

Post by Paul Smith
Hi Will,
It sounds like your kamailio.cfg is not looking up the user location
database before trying to relay the INVITE. There is a relevant section in
request_route {
...
# user location service
route(LOCATION);
}
...
# USER location service
route[LOCATION] {
if (!lookup("location")) {
$var(rc) = $rc;
t_newtran();
switch ($var(rc)) {
send_reply("404", "Not Found");
exit;
send_reply("405", "Method Not Allowed");
exit;
}
}
# when routing via usrloc, log the missed calls also
if (is_method("INVITE")) {
setflag(FLT_ACCMISSED);
}
route(RELAY);
exit;
}
The logic is that if the call is for a local registered user whose
location is available in the "kamctl ul" then request_route() should pass
the request to the route(LOCATION) routine. The function call
lookup("location") then does the magic if matching the address of record
the call on to the phone's actual IP address.
Hope that helps.
Paul Smith
Hi
I was wondering if any one had any advice or examples for me of how to
get a call to be routed to a subscribed softphone.
We have 2 boxes in our testing deployment, a load balancer / sbc and a
call processing box.
Calls come in to the sbc, and then are passed to the call processing
box. The call is analyzed and the branch uri is rewritten to a destination
address when applicable for the call (this is how we handle routing of
calls to certain numbers -- we do this utilizing custom code and a custom
db).
This works just fine when the destination sip uri is phone number (in
which case we do lcr) or if the destination goes to a remote address.
sbc, which passes it to the callprocessing box, back and forth until a too
many hops error occurs.
The subscriber I am trying to send the call too does show up under
"kamctl ul show".
I feel like there is something basic I must be missing here.
Does any one have any advice for me?
Thank you very much in advance.
All the best.
Will Ferrer
_______________________________________________
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

[Paul Smith]

Great stuff.

NAT is a whole other basket of pain. Again the example configs in the
kamailio distribution are a good place to start... in particular the
NATDETECT and NATMANAGE routines, and the nathelper and rtpproxy module
usage.

good luck

Post by Will Ferrer
Hi Paul
Just wanted to give you an update.
This looks like it has worked. Now I am dealing with my own natting
issues on my home network to get the call but the invites are being
sent right now.
Thanks again for the assistance.
All the best.
Will Ferrer
On Wed, Oct 1, 2014 at 11:53 PM, Paul Smith
Hi Will,
It sounds like your kamailio.cfg is not looking up the user
location database before trying to relay the INVITE. There is a
request_route {
...
# user location service
route(LOCATION);
}
...
# USER location service
route[LOCATION] {
if (!lookup("location")) {
$var(rc) = $rc;
t_newtran();
switch ($var(rc)) {
send_reply("404", "Not Found");
exit;
send_reply("405", "Method Not Allowed");
exit;
}
}
# when routing via usrloc, log the missed calls also
if (is_method("INVITE")) {
setflag(FLT_ACCMISSED);
}
route(RELAY);
exit;
}
The logic is that if the call is for a local registered user whose
location is available in the "kamctl ul" then request_route()
should pass the request to the route(LOCATION) routine. The
function call lookup("location") then does the magic if matching
route(RELAY) is then able to send the call on to the phone's
actual IP address.
Hope that helps.
Paul Smith

Post by Will Ferrer
Hi
I was wondering if any one had any advice or examples for me of
how to get a call to be routed to a subscribed softphone.
We have 2 boxes in our testing deployment, a load balancer / sbc
and a call processing box.
Calls come in to the sbc, and then are passed to the call
processing box. The call is analyzed and the branch uri is
rewritten to a destination address when applicable for the call
(this is how we handle routing of calls to certain numbers -- we
do this utilizing custom code and a custom db).
This works just fine when the destination sip uri is phone number
(in which case we do lcr) or if the destination goes to a remote
address.
to the sbc, which passes it to the callprocessing box, back and
forth until a too many hops error occurs.
The subscriber I am trying to send the call too does show up
under "kamctl ul show".
I feel like there is something basic I must be missing here.
Does any one have any advice for me?
Thank you very much in advance.
All the best.
Will Ferrer
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users

[Will Ferrer]

Hi Paul

I think we have our nat stuff working on the kamailio server. The problem
now for me seems to be that I have a restrictive nat going on my home
network which is preventing me from receiving calls.

I am going to do some research on changing up my network here for testing.

Thanks again for all the great help.

I hope you have a wonderful weekend.

Will

Post by Paul Smith
Great stuff.
NAT is a whole other basket of pain. Again the example configs in the
kamailio distribution are a good place to start... in particular the
NATDETECT and NATMANAGE routines, and the nathelper and rtpproxy module
usage.
good luck
Hi Paul
Just wanted to give you an update.
This looks like it has worked. Now I am dealing with my own natting
issues on my home network to get the call but the invites are being sent
right now.
Thanks again for the assistance.
All the best.
Will Ferrer

Post by Paul Smith
Hi Will,
It sounds like your kamailio.cfg is not looking up the user location
database before trying to relay the INVITE. There is a relevant section in
request_route {
...
# user location service
route(LOCATION);
}
...
# USER location service
route[LOCATION] {
if (!lookup("location")) {
$var(rc) = $rc;
t_newtran();
switch ($var(rc)) {
send_reply("404", "Not Found");
exit;
send_reply("405", "Method Not Allowed");
exit;
}
}
# when routing via usrloc, log the missed calls also
if (is_method("INVITE")) {
setflag(FLT_ACCMISSED);
}
route(RELAY);
exit;
}
The logic is that if the call is for a local registered user whose
location is available in the "kamctl ul" then request_route() should pass
the request to the route(LOCATION) routine. The function call
lookup("location") then does the magic if matching the address of record
the call on to the phone's actual IP address.
Hope that helps.
Paul Smith
Hi
I was wondering if any one had any advice or examples for me of how to
get a call to be routed to a subscribed softphone.
We have 2 boxes in our testing deployment, a load balancer / sbc and a
call processing box.
Calls come in to the sbc, and then are passed to the call processing
box. The call is analyzed and the branch uri is rewritten to a destination
address when applicable for the call (this is how we handle routing of
calls to certain numbers -- we do this utilizing custom code and a custom
db).
This works just fine when the destination sip uri is phone number (in
which case we do lcr) or if the destination goes to a remote address.
sbc, which passes it to the callprocessing box, back and forth until a too
many hops error occurs.
The subscriber I am trying to send the call too does show up under
"kamctl ul show".
I feel like there is something basic I must be missing here.
Does any one have any advice for me?
Thank you very much in advance.
All the best.
Will Ferrer
_______________________________________________
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users