Setting up a Voice call from ONT/OLT to Softswitch via SBC

                   Hi,
                         I am setting up a voice call over SBC to softswitch basically SIP over ISUP,now i have a small issue that my SIP user is getting registerd at both SBC and Softswitch and able make OG/IC calls.
Now my question is whether will i be able to ping the client ip from SBC,since i am not able ping the client ip.is there any firewall restriction at OLT/ONT side.

Hi HW,
The PBX is a Panasonic TA308. There is no special interface to the PBX,  the  line port on the SPA3102 is simply plugged into an extension, like another phone. Anyone calling that extension will have the call routed through the SPA & PAP2 to the remote phone.
The whole setup is totally seamless, & transparent to the user. As we are on a local network there is virtually no latency. There is a slight tendancy to echo,  but the echo suppression mostly takes care of that.
THis has been a good exercise, and once I got my head around what I was trying to do, with your help,  it was pretty easy.  I think the hook flash timing would be the thing which gives most users a problem, as it seems to vary widely around the world. I was surprised at the difference between the US and NZ (.1 & .9 to .07 & .13).  There didn't seem to be any other critical differences.
Now I am the local expert on VoIP   "In the Kingdom of the blind, the one-eyed man is King."

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