Q on VoIPo SIP outbound vs. router

[voipinit]

I wonder if SIP ALG is re-writing the packet to use your public IP as opposed to using NAT and discarding the original. Does your traffic decrease with SIP ALG disabled?

[stevech]

I wonder if SIP ALG is re-writing the packet to use your public IP as opposed to using NAT and discarding the original. Does your traffic decrease with SIP ALG disabled?

While I await a response from Cradlepoint tech support, all I can say is what the log says

"SIP ALG rejected packet from 192.168.1.51:5079 to 72.51.46.124:5060"

where the source is the VoIP device and the destination is the SIP server I am assigned. One must assume that the packet would get NATed to my public IP address had ALG not rejected it as formatted by the Grandstream.

EDIT: I did find this statement from a lay-person:
"As most modern sip clients are NAT aware, there really isn't a need for the sip alg."
But I wonder if this applies to the NAT traversal techniques in the Grandstream client?


To be clear: The VoIPo service works OK, this is an admin issue.