Bruce Komito wrote:
> In sip.conf, try setting canreinvite=no for both lines. > > Bruce Komito > High Sierra Networks, Inc. > www.servers-r-us.com > (775) 284-5800 ext 115
canreinvite=no will sometimes make a difference but, I believe that what most people are running into is what I described in my previous post. NAT devices track IP flows. When you have two "flows" from the asterisk server that look like:
ast.erisk.serv.er:5060<->nat.wan.ip.addr:5060<->NAT<->10.1.1.1:5060 ast.erisk.serv.er:5060<->nat.wan.ip.addr:5060<->NAT<->10.1.1.2:5060
The NAT device has no way of deciding which of the two or more SIP devices (hardphone or softphone) on the inside the flow is supposed to go to. It looks through it's flow database and sees that there are two potential candidates on the inside that could be the owner of the flow.
When you make sure that your SIP devices behind the NAT use unique source ports, you end up with this:
ast.erisk.serv.er:5060<->nat.wan.ip.addr:5061<->NAT<->10.1.1.1:5061 ast.erisk.serv.er:5060<->nat.wan.ip.addr:5062<->NAT<->10.1.1.2:5062
I guess that many people don't really truly understand how the NAT works on the raw level and it's a plug and play device to them. For that matter, I have been running large scale networks for nearly 16 hears and I got bit by the same thing because I assumed that the Cisco would do the "Right_Thing" (TM) and choose a random source port. Once I discovered that it didn't do that, it was a simple matter of telling it to do so.
I suppose that this is also somewhat the fault of the NAT device (linksys/cisco) as well since it should have noticed that there were two devices on the inside of the NAT trying to create identical flows. It could have easilly done some mapping to change the source port on the WAN side of the connection of one of the flows.
OK. This is the * list and not routing 701 so, I'll stop now. Suffice it to say that it is a good idea to have unique source ports if you have multiple devices on the inside contacting the same device:port on the outside.
John Fraizer EnterZone, Inc http://www.enterzone.net/
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