[Serusers] sip load balancing

[Karunakar Chemudugunta]

I have a same problem as explained below.

PSTN ---> VOIP GATEWAY(Cisco AS5400) --> SER-------> Multiple media gateways.

Planning to depoy media servers which can able to running IVR
fuctionality and would like to use SER in front of lot of media
gateways.

Each media gateway, might be running lot of user agents which are able
to serve IVR fuctionality. all these user agents are going to register
with SER with <media server hostname_channel number>  format as user
name. Eg. mediaserver1_ch1 at mydomain.com

Otherside, SER will receive call from PSTN through VOIP Gateway with
multiple DIDs and these calls need to route calls to media gateways (
typical hosted call center environment )


I have tried with lot of possibities using ser.cfg file and did n't
find way to route calls to media gateways.

Just I am thinking, it would be possible to write another module or
part of userloc module, which gives a routing fuctionality like cyclic
or rotary senarios which helps load balancing and easy maintenance of
media servers.

Possible solution
------------------------------
Lets assume, if we have resource file called resource.cfg which has
all did and resource mapping. All resource names are substring of
usernames of useragents in media servers.
resource.cfg
##########################################
resource:resource1 =
mediaserver1,mediaserver2,mediaserver3,mediaserver4,mediaserver5

did:8005551212 = cyclic:resource1
did:8005551213 = rotary:resource1

##########################################

every invite message need to call fuction like lookup_route() instead
of lookup() in ser.cfg


this fuction instenally calls routing module, searches for did in
resource file and get corresponding resource type( rotary or cylic),
resource name.

search each resource member in useloc using function get_urecord  and
it if avaialbe and route calls to that particar user.

Summary: 

1.  ser receives call from PSTN
2.  Finds resource name for DID
3.  Find resource string depend of type of routing from resorce list.
4.  Serach usrloc database with resource string as sub string of
usernames in userloc database.
5. Forward call to that particular media gateway.


Welcome for any comments and thoughts ?

Thanks,
Karun Chemudugunta
  




On 5/10/05, a c <lra101 at yahoo.com> wrote:
> hello Iqbal,
> 
>  just need the SIP messages load balance across
> servers. No RTP.
> 
> thank you
> ac
> 
> --- Iqbal <iqbal at gigo.co.uk> wrote:
> > mediaproxy can do it using dns. Am assuming you want
> > the rtp stream load
> > balanced, if its the sip messages, search throuygh
> > the archives there is
> > along discussion bout howto use LVS and load
> > balancing....in short
> > doesnt seem to work, cause SIP uses udp
> >
> > Iqbal
> >
> > a c wrote:
> >
> > >hello,
> > >
> > > got a question on SER. Could SER do load balance
> > >across SIP servers?
> > >
> > >for example:
> > >
> > >SIP carrier --> SER --> Media/App Servers
> > {multiple}
> > >
> > >Are there any Configuration examples I can look at?
> > >
> > >thank you
> > >ac
> > >
> > >
> > >
> > >__________________________________
> > >Yahoo! Mail Mobile
> > >Take Yahoo! Mail with you! Check email on your
> > mobile phone.
> > >http://mobile.yahoo.com/learn/mail
> > >
> > >_______________________________________________
> > >Serusers mailing list
> > >serusers at lists.iptel.org
> > >http://lists.iptel.org/mailman/listinfo/serusers
> > >
> > >.
> > >
> > >
> > >
> >
> 
> __________________________________
> Do you Yahoo!?
> Yahoo! Mail - Find what you need with new enhanced search.
> http://info.mail.yahoo.com/mail_250
> 
> _______________________________________________
> Serusers mailing list
> serusers at lists.iptel.org
> http://lists.iptel.org/mailman/listinfo/serusers
>