Hello Matt,
In OpenSIPS you need to use the onreply route to get access to those 200
OK replies (from FreeSwitch). In there use
fix_nated_sdp("2","FS_public_ip") to rewrite the IP in the SDP:
http://www.opensips.org/html/docs/modules/1.11.x/nathelper.html#id293864
Regards,
Bogdan-Andrei Iancu
OpenSIPS Founder and Developer
http://www.opensips-solutions.com
On 19.01.2015 17:54, Matt Broad wrote:
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
<http://192.168.0.2:5080/>', | 'pstn=10', | '2', |
'FS1'
'2', | '1', | 'sip:192.168.0.3:5080
<http://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
<http://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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