[VoiceOps] Mitel 3300 - NAT - Media Issue

Jason Nesheim jnesheim at telepacific.com
Tue Apr 3 12:40:45 EDT 2012

We've encountered this type of NAT issue with multiple PBX systems.  The most reliable solution we've found for the array of PBX level problems  is to put a small SBC at the site to handle NAT/media traversal and any header rewrites needed.  A Cisco ISR router running CUBE or an Acme Packet SBC work fine, and I'm sure there are others out there that could be used as well.

Jason Nesheim
Manager, Network Architecture
TelePacific Communications
Office: 702-405-3571
Mobile: 702-885-0815
Fax: 702-724-2110

From: voiceops-bounces at voiceops.org [mailto:voiceops-bounces at voiceops.org] On Behalf Of Robert Dawson
Sent: Tuesday, April 03, 2012 6:41 AM
To: voiceops at voiceops.org
Subject: [VoiceOps] Mitel 3300 - NAT - Media Issue

Working with someone on SIP trunks for a Mitel 3300. The Mitel is sitting behind a NAT on a Cisco 3700 (i.e. no fixup/ALG) and inbound media is failing because the phones private IPs are being targeted directly in the SDP. Even if I force all media back to the NAT address it still fails because there is no translation for the phones.

Anyone know if there is a way to force the Mitel to proxy the media or have any insight into getting around this shy of putting a proxy at the customer site(which is what we should probably do anyway)?


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