Calls from POTS can automatically go to Auto Attendant and any phone registered to SPA9000 can call out on POTS by dialing the User-ID on the SPA3000's PSTN Line (103).
Register Line 1 of SPA9000 to VoIP (Optional). Access the SPA9000's web-based setup page, and click Admin Login then advanced.
Click Voice then Line 1. Scroll down and under Subscriber Information, provide the necessary information for the User ID and Password fields. Under Proxy and Registration, look for Proxy, and enter the required proxy value given by your VOIP provider. Scroll down to the bottom, and click in order to save your settings.
Click Line 2 and set Line 2 of the SPA9000 with a User-ID (ie:103) then click Submit All Changes.
Access the SPA3000's web-based setup page. Click Admin Login, then advanced.
Click PSTN Line.
Scroll down and under Proxy and Registration, manually register the PSTN Line of SPA3000 to SPA9000.
Proxy: 192.168.0.1:6060 (SPA9000 Proxy Network Interface is set to LAN)
User-ID: 102 (example only)
Scroll down and under FXO Timer Values (sec), enter "0" in the PSTN Ring Thru CWT Delay and PSTN Answer Delay fields.
Under PSTN-To-VoIP Gateway Setup, look for PSTN Ring Thru Line 1 and select No from the drop down menu. Enter "2" in the PSTN Caller Default DP field.
Scroll up, look for Dial Plans, and enter "(S0<:103>)" in the Dial Plan 2 field. Click Submit All Changes in order to save your settings.