Hi , Sorry for previous email. Hit send too soon .
Good morning, On my system i've a structure similar to:
SIP Clients SIP Platform [-------------------] [---------------------------------] S1 @IP2
S2 @IP3 SIP UACs SIP LB ... [NATted and @IP1 non Nattted] SN @IPN
SIP LB is based on Kamailio dispatcher and is responsible of distributing the load between different Servers SIP UAS.
S1, S2,... SN Servers have a Kamailio Server too which will forward received balanced traffic to appropiate service (Presence , registrar,...)
Considering SIP LB and all SIP UAS have Public IP, how NAT from the UACs could be handled on this scenario?
Initially I thought NAT should be handled on SIP LB however I would like the most simple possible load balancer with no need to read user locations . Responsible of location users should be S1,S2,..:SN
Then, would it be possible to handle NAT of the SIP UACs *from the SIP UAS *with NAT Helper module? What i'm afraid is: If all traffic to S1,S2,..SN comes from SIP LB then nat_helper could think all clients are NATTed because top most via will be SIP LB.
What I need, I think, is that NAT Helper decides if there is NAT looking the Via Header added originally by UAC , and not the top most via (which would be SIP LB). Is that possible? If possible how should i configure Nat helper for that?
BR Albert