[asterisk-users] Multiple SIP phones behind a Linksys firewall

[john at quonix.net]

The server is at a remote datacenter - no nat, no firewall, pure public 
IP. 

The phones are at home offices (i.e. DSL or Cable with Linksys-type 
firewall/routers). 

My initial testing was with a single SIP phone at the home office - and 
everything worked fine. But when I have two SIP phones at the home office, 
things start behaving badly. 

I understand the issue of phone-to-phone, where both phones are behind a 
nat at the home office - but that is not the issue I am having. 

My main problem is when I have two phones at the home office, the second 
phone cant register, and/or, you cant here the voicemail greeting when you 
try to check messages. 





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