Configure cisco

I have cisco 2921. 1) It's necessary to configure Linksys PAP2 adapter and connect this Linksys to Cisco 2921. I tried to configure it, but failed, Linksys doesn't connect to Cisco 2921 using SIP. I have connected analog fax to Linksys and want to receive and send a fax 2) There is cisco 7125 in another office and something about 300 phone numbers. I'd like to use something similar to speed dial. For example instead of calling 8 123 1234567 "pause" "additional 1234" I'd like to dial 5 "pause" "additional 1234" Is it possible ? It should work so: 1) incoming call - 2) playing .wav file - 3.1) redirect to internal number 101 or 3.2) a caller can dial 3-digit internal number. But after playing .wav file the incoming call is dropped instead of redirecting to 101 It's necessary to fix it and to configure cisco 2921 to get working