gunawan wrote: Just for clarification this isn't my site. This is where some of the documents associated with the Internet2 working group of which I am a member. No it is not my phon enumber. This is an example only. The value following dial-peer voice is just a label to uniquely identify that dial-peer. The value specified in the destination-pattern parameter is what is matched against the dialed digits. In this example the 6800[1-9] specifies a range of numbers from 68001 through 68009. These are real Centrex extensions within our numbering plan bu tthey are test numbers reserved for use by our VoIP project. We use 5 digits because that is how many digits our Centrex provider hands us in the call setup message. Same as above. This is an illustration. The 61 is just a label . In this example 61 is the first dial-peer defined to handle outbound calls to Centrex extensions 6xxxx. The FXS and FXO peers are similar to those mentioned in the document. You may need to fiddle with parameters for your specific type of connection. You may need to know if you are using wink-start or loop-start signaling, what port to use, etc. A very basic setup would include something like: voice-port 1/0/0 input gain 10 connection plar opx 32766 description FXO 1/0/0 5732767 for VoIP dial-peer voice 91 pots destination-pattern 9 port 1/0/0 prefix 9 ! -- ISC Network Engineering The University of Pennsylvania 3401 Walnut Street, Suite 221A Philadelphia, PA 19104 voice: 215-573-8396 215-746-8001 fax: 215-898-9348 sip:blairs@upenn.edu