I'm having some troubles getting SIP helper to work.
I'm running grandstream GXW4004 gateways to Voip Innovations.
I feel like I've tried every possible config.
port 5080 for sip, 5090-5094 for RTP. No registration is used.
Basically, I want to avoid entering in the NAT IP address in the grandstream, and instead have SIP Helper adjust the 'src' address. I have a redundant internet connection and when the gateway switches to the backup, I want the SIP Helper to write the new gateway because the grandstream doesn't have a mechanism to change this.
Also note that the grandstream's STUN settings don't update the return address so STUN can't be used to solve this.