Nitzan Kon wrote: > --- On Mon, 1/5/09, Alex Balashov <[email protected]> wrote: > >> I'd just drop the carrier if I were you. > > That has crossed my mind more than once. ;) Their quality is > great though other than this problem so I go back and forth > on this one. > >> 1. Do you have this problem with other carriers? To the >> same degree? > > Nope. This happens only with this carrier. > >> 2. What happens when you do proxy the media and use that as >> your accounting basis; does your billing reconcile with this >> carrier almost perfectly? > > We proxy almost all media because most of our users are behind > NAT so it wouldn't make sense not to do so.
Well, I hate to open up what seems to be a particularly contentious can of worms, but, you actually probably don't need to be proxying media for most of these users. :-) Just because they're behind NAT doesn't mean they can't reach each other. Here's the canned answer from our VoIP FAQ: --- "Q: Do I have to use a media proxy with Kamailio/OpenSIPS for a far-end NAT traversal solution?" "A: Not necessarily, although it may be desirable in various cases for reasons having to do with accounting or topology hiding. Use of a media proxy is strictly necessary only in cases where there is no logical network-layer reachability between the media endpoints of a SIP session. An example would be media passing between a public and a private (RFC1918) address space with no NAT on the private side, and a SIP proxy that is connected to both; there is no way for the public endpoint to address the private endpoint. NAT-traversal fixups revolve around substituting received IP and port information (Layer 3 & 4) in place of that provided by the endpoints themselves. If the endpoints can reach each other at the rewritten coordinates, there is no reason to proxy the media." --- Of course, this will break for a certain percentage of users who have NAT gateways or UACs that just don't get it. -- Alex -- Alex Balashov Evariste Systems Web : http://www.evaristesys.com/ Tel : (+1) (678) 954-0670 Direct : (+1) (678) 954-0671 Mobile : (+1) (678) 237-1775 _______________________________________________ --Bandwidth and Colocation Provided by http://www.api-digital.com-- asterisk-biz mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-biz
