From side Elastix, you must make an SIP trunk with the IP address (gateway Patton), the preferred codec, the user and secret. Put the context (from-pstn or from-trunk), the dtfmmode (rfc2833).
Make an outbound route and choice your trunk.
For the gateway Patton, put the Elastix sever IP ..Etc
Now, how do it? I don't know. :huh: