[VoiceOps] ACME behaviour with Bad NAT Firewalls

Mark Holloway mh at markholloway.com
Fri Jun 10 00:51:38 EDT 2011

Are you indicating that simply using the higher port numbers without ALG invokes a more successful and consistent behavior for IP PBX trunking or is this specific to Hosted IP? 

On Jun 9, 2011, at 9:35 AM, anorexicpoodle wrote:

> We have had a great deal of success simply abandoning port 5060 and using port numbers over 10000 on the endpoint and SBC, since most ALG's simply do protocol detection based on port, this will dodge much of your ALG/fixup headaches straight away. There are of course still some CPE routers with a more clever ALG that will catch this, but it dramatically reduces your exposure. 

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