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I was playing with a Sprint Vision phone recently and noticed when viewing the low level ReadyLink configuration screens that there are references to SIP registrars and the like. Does anyone happen to know if Sprint's implementation of ReadyLink truly is SIP based, and if so, managed to get it to interoperate with Asterisk. If so, it would prove to be an interesting paging mechanism and

Hello Folks- Pretty new to the list here, got a lot of reading to do.. Does anyone know where I can find a decent HOWTO or set of instructions for running Asterisk and SIP clients thru firewall/NAT systems? I have a Asterisk box sitting behind a linux firewall at a remote location and have the 5060 and etc ports open as well at 16381-16391 UDP open and routed to the Asterisk box as well. I have

Quick question re. NAT traversal. I understand how sitting behind a NAT could cause problems for a SIP UA. The SIP UA would create SIP mesages using IP addresses from inside the network (i.e. 192.#.#.# or 10.#.#.#) and these IP addresses are of course unnavigable for the recipient. What I don't get is why don't web browsers suffer the same problem? A web brower behind a NAT sends an