[VoiceOps] Screwy DSL modem NAT troubles

[Matthew S. Crocker]

Has anyone else noticed that the latest batch of DSL modems have broken NAT when it comes to VoIP?   I'm seeing stable VoIP customer get broken when the DSL modem is swapped out.  The modem NATs the phones to modem IP port 5060.  So, 10 phones behind the router become one phone to the SBC.  A race condition occurs and phones go in and out of service at random.  It looks like the router is trying to do a SIP ALG but very very broken.

Do anyone have a DSL modem/router they use that works well with VoIP?

-- 
Matthew S. Crocker
President
Crocker Communications, Inc.
PO BOX 710
Greenfield, MA 01302-0710
http://www.crocker.com
P: 413-746-2760