Todd, you've got half the battle conquered.
For the incoming pstn line call to ring the distant PAP2T you would have the following configured:
On the SPA3102 PSTN Line Tab:
PSTN-To-VoIP Gateway Enable: yes
PSTN Caller Auth Method: none
PSTN Ring Thru Line 1: probably no unless you want the phone locally attached to the SPA3102 to ring on an incoming pstn line call.
PSTN CID for VoIP CID: yes
PSTN Caller Default DP: 2
Off Hook While Calling VoIP: no
Dial Plan 2: (S0<:userid@ip_address:port>)
where userid is any userid you have setup on the PAP2T Line configuration, ip_address is the PAP2T ip address, port is the Sip Port configured on the PAP2T Line configuration.
Make Call Without Reg: Yes
PSTN Answer Delay: 3 (long enough to receive the incoming caller id). Make setting longer if you wish the phone locally attached to the SPA3102 to ring on an incoming pstn line call.
On the SPA3102 Line Tab:
Enable IP Dialing: Yes
On the PAP2T Line Tab Configuration:
Ans Call Without Reg: Yes
