I have a SIP trunk from bandwidth.com. I have dedicated an IP to it but now the questions is how best to connect it into CUCM 7. I have a PIX 525 and a 3745 router. I connect via ethernet to my ISP to their router (a c851) which I have NO ACCESS to. bandwidth.com suggests that I purchase an Edgewater Edgemark ALG, but to my knowledge, my PIX 525 already supports those functions. Is it possible for me to bring the SIP trunk into the PIX on an outside interface and then use CUCM with MGCP to control it? How would I route calls to the PSTN through bandwidth.com's trunk? I have practically no experience with SIP so am very much in the dark here. Currently I only have the 1 trunk for testing purposes but if it works out well, I plan to add several more. I'm not sure what the best scenario is. I know that bandwidth.com does NOT use SIP registration. Any suggestions on how to configure this are very much appreciated. I've read documents that talk about configuring SIP on the ASA/PIX, but none of these mention anything in regards to dial-peers etc. Do I need dial-peers? I've configured those on routers for h.323 gateways, but again, I know nothing really when I coms to SIP, am still very new to this technology. Any advice welcome. Thanks again. For what it is worth, I have multiple interfaces available on both the PIX and the router.