[cisco-voip] Cisco IP Phones receiving two calls from CCM 5.1

[Andy Saykao]

Yeah we've emailed PortaBilling to see if there's any primary/failover
feature with their software. No word back from them yet. I'm more
inclined to think that they won't have such a feature. 
 
Anyway, we've played around with Cisco SLB where the sip gateway
forwards the sip packet to the SLB who then delivers it to one of the
two CCM's. This isn't working to well because the SIP headers aren't
being correctly modified and I'm about to give up on doing it this way. 
 
Does anyone have a better idea or some applicataion that we could use so
that PortaBilling (SIP gateway) will first forward the sip packet to an
intermedite application/proxy which will correctly rewrite the sip
headers and then forward the sip packet onto one of the two CCM's??
 
________________________________

From: Matt Slaga (US) [mailto:Matt.Slaga at us.didata.com] 
Sent: Thursday, 7 February 2008 1:44 AM
To: Andy Saykao; cisco-voip at puck.nether.net
Subject: RE: [cisco-voip] Cisco IP Phones receiving two calls from CCM
5.1



It sounds like you have (or they have) portabilling configured with two
separate SIP servers for your CallManagers, and not primary/failover.

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Andy Saykao
Sent: Wednesday, February 06, 2008 12:39 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] Cisco IP Phones receiving two calls from CCM 5.1

 

Hi there,

 

We are running two Cisco Call Manager 5.1 servers here and need to
integrate this with our current SIP set up which uses PortaBilling. When
external calls come into our SIP gateway (PortaBilling), they are
forwarded to the Cisco Call Managers (CCM). Because we have TWO CCM's
(for redundancy), PortaBilling forwards it to both Call Mananger Server
and we end up with two calls showing up on our Cisco IP Phone PLUS it
takes up two media (dsp) channels. 

 

Is there something that can be done from either Porta or on the Cisco
Call Manager to prevent this from happening so we only receive one call?
Maybe clustering of the CCM's???

 

Anyone help would be greatly appreciated.

 

Thanks.

Andy

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