12 Mar
2012
12 Mar
'12
10 a.m.
Hello,
I have read here about load balancing between multiple gateways by using
carrierroute module, but there is one particular question for which I
found no answer.
Let's say I have two asterisk servers (X und Y), that are my gateways to
PSTN. Let we do it simple. Let's say that each gateway supports only one
outgoing call at the time and there is no incoming calls from PSTN. Now:
Bob calls one number and Kamailio uses X gateway.
Alice calls other number and Kamailio uses Y gateway.
Alice terminates the call.
Alice place a new call, but Bob's call is still in progress.
If we were used round robin algorithm, Kamailio would then use X
gateway, but X gateway is currently occupied. What shell happen now?
And what if Alice didn't tear down call ordinary? What if it her SIP
client simply crashed? (Then kamailio would think that there is now free
gateway)
So the main question is: can kamailio know/detect, how much calls are
going over one particular gateway and what can be done when limit for
this gateway is reached?
Thank you in advance.
Kind Regards,
Sasa Vilic
12 Mar
12 Mar
10:11 a.m.
New subject: Kamailio + Asterisk, what happens when limit for gateway is reached
Hi!
Kamailio can count the number of calls per gateway and use the least
loaded one. Another approach, which is more reliable uses
failure-routing. This means, the load balancer chooses any of the
gateways, but if the gateway response with a certain error code, the
"failure_route" will choose the next gateway and re-sends the request.
You can do the failure routing multiple times until you ran out of gatways.
regards
Klaus
Am 12.03.2012 10:00, schrieb Sasa Vilic:
Hello,
I have read here about load balancing between multiple gateways by
using carrierroute module, but there is one particular question for
which I found no answer.
Let's say I have two asterisk servers (X und Y), that are my gateways
to PSTN. Let we do it simple. Let's say that each gateway supports
only one outgoing call at the time and there is no incoming calls from
PSTN. Now:
Bob calls one number and Kamailio uses X gateway.
Alice calls other number and Kamailio uses Y gateway.
Alice terminates the call.
Alice place a new call, but Bob's call is still in progress.
If we were used round robin algorithm, Kamailio would then use X
gateway, but X gateway is currently occupied. What shell happen now?
And what if Alice didn't tear down call ordinary? What if it her SIP
client simply crashed? (Then kamailio would think that there is now
free gateway)
So the main question is: can kamailio know/detect, how much calls are
going over one particular gateway and what can be done when limit for
this gateway is reached?
Thank you in advance.
Kind Regards,
Sasa Vilic
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sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
10:19 a.m.
New subject: Kamailio + Asterisk, what happens when limit for gateway is reached
Hello,
On 3/12/12 10:11 AM, Klaus Darilion wrote:
Hi!
Kamailio can count the number of calls per gateway and use the least
loaded one.
not sure this is out of the box with carrier route module, but
dispatcher module has call load balancing. Another option to track
active calls per destination is using dialog module and profiles.
However, I would go with round robin and the failure route solution as
pointed by Klaus, it is more flexible and lightweight.
Cheers,
Daniel
Another approach, which is more reliable uses
failure-routing. This
means, the load balancer chooses any of the gateways, but if the
gateway response with a certain error code, the "failure_route" will
choose the next gateway and re-sends the request. You can do the
failure routing multiple times until you ran out of gatways.
regards
Klaus
Am 12.03.2012 10:00, schrieb Sasa Vilic:
--
Daniel-Constantin Mierla
Kamailio Advanced Training, April 23-26, 2012, Berlin, Germany
http://www.asipto.com/index.php/kamailio-advanced-training/
Hello,
I have read here about load balancing between multiple gateways by
using carrierroute module, but there is one particular question for
which I found no answer.
Let's say I have two asterisk servers (X und Y), that are my gateways
to PSTN. Let we do it simple. Let's say that each gateway supports
only one outgoing call at the time and there is no incoming calls
from PSTN. Now:
Bob calls one number and Kamailio uses X gateway.
Alice calls other number and Kamailio uses Y gateway.
Alice terminates the call.
Alice place a new call, but Bob's call is still in progress.
If we were used round robin algorithm, Kamailio would then use X
gateway, but X gateway is currently occupied. What shell happen now?
And what if Alice didn't tear down call ordinary? What if it her SIP
client simply crashed? (Then kamailio would think that there is now
free gateway)
So the main question is: can kamailio know/detect, how much calls are
going over one particular gateway and what can be done when limit for
this gateway is reached?
Thank you in advance.
Kind Regards,
Sasa Vilic
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users
_______________________________________________
SIP Express Router (SER) and Kamailio (OpenSER) - sr-users mailing list
sr-users(a)lists.sip-router.org
http://lists.sip-router.org/cgi-bin/mailman/listinfo/sr-users 
11 a.m.
New subject: Kamailio + Asterisk, what happens when limit for gateway is reached
On 03/12/2012 11:00 AM, Sasa Vilic wrote:
Hello,
I have read here about load balancing between multiple gateways by
using carrierroute module, but there is one particular question for
which I found no answer.
Let's say I have two asterisk servers (X und Y), that are my gateways
to PSTN. Let we do it simple. Let's say that each gateway supports
only one outgoing call at the time and there is no incoming calls from
PSTN. Now:
Bob calls one number and Kamailio uses X gateway.
Alice calls other number and Kamailio uses Y gateway.
Alice terminates the call.
Alice place a new call, but Bob's call is still in progress.
If we were used round robin algorithm, Kamailio would then use X
gateway, but X gateway is currently occupied. What shell happen now?
And what if Alice didn't tear down call ordinary? What if it her SIP
client simply crashed? (Then kamailio would think that there is now
free gateway)
So the main question is: can kamailio know/detect, how much calls are
going over one particular gateway and what can be done when limit for
this gateway is reached?
Hello,
Carrierroute module support load balancing based on weights(so it can be
non-uniform distribution).Keep in mind that this works on large numbers
of calls, so on the long run we will have 50-50% load on the servers
(given enough calls). For small number of calls (like your example) the
carrierroute module has no way of determining to route on the other
gateway.
As others suggested, you can use failure_route to route between
gateways. Carrierroute module supports this over the failure route table.
Cheers,
Marius
Thank you in advance.
Kind Regards,
Sasa Vilic
--
Zbihlei Marius
Head of
Linux Development Services Romania
1&1 Internet Development srl Tel KA: 754-9152
Str Mircea Eliade 18 Tel RO: +40-31-223-9152
Sect 1, Bucuresti mailto: marius.zbihlei(a)1and1.ro
71295, Romania
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3 comments
4 participants
participants (4)
-
Daniel-Constantin Mierla -
Klaus Darilion -
Marius Zbihlei -
Sasa Vilic