[OpenSIPS-Users] load balancer

[Matt Broad]

Hi,


I was looking for some guidance on using the load balancer in a NAT
environment.

I have the following setup (the IP addresses are made up but should give an
indication):

1 x opensips server with load balancer module - IP 192.168.0.1
2 x freeswitch servers - IP 192.168.0.2 & 192.168.0.3

All 3 servers have seperate external IP address routing to their internal
IP via our firewall:
217.0.0.1 routed to 192.168.0.1 (Opensips)
217.0.0.2 routed to 192.168.0.2 (FS1)
217.0.0.3 routed to 192.168.0.3 (FS2)

I have the load_balancer table with the following details:

id,  | group_id, |                  dst_uri,            | resources,  |
probe_mode, | description
'1',  |      '1',     |  'sip:192.168.0.2:5080',  |   'pstn=10', |
 '2',       |          'FS1'
'2',  |      '1',     |  'sip:192.168.0.3:5080',  |   'vm=1',     |
'2',       |          'FS2'


The call flow is:

SIP Provider --> 217.0.0.1 Opensips --> 192.168.0.2/3

The issue is, that when the 200 ok response is sent to the SIP provider,
the Freeswitch server's internal IP is being sent in the SDP connection
information (c).  This causes the ACK response from the SIP Provider to
fail to be sent correctly.

With the calls routed directly to the FS servers (removing opensips from
the flow), the calls work fine.

Any help would be much appreciated :)


thanks
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