Need a fix for Behind NAT/Firewall SIP devices

Asterisk Asterisk Support
1

Hi

Is there any solution or fix to overcome Behind NAT/Firewall devices, as those sip devices become “UNREACHABLE” in 2 to 3 minutes after successful registration.

Also some of the ISP’s are blocking the standard 5060 port. So our customers are not able to register from their end. Is there a way to overcome this on Asterisk.

Your help is much Appreciated…

Thanks & Regards
Vino

2

Hi

Have you got qualify set to a low enough setting. ?

[quote]Also some of the ISP’s are blocking the standard 5060 port. So our customers are not able to register from their end. Is there a way to overcome this on Asterisk.
[/quote]

VPN tunnel or try another port, But many ISPs are blocking on content not port.

IAn

3

Hi IAN,

Thanks for your reply…

I’ve made the qualify value as 60000, to check if the device answers within 1 minute.

But still, the devices which are specifically behind firewall (VoIP Un-aware firewall), doesn’t consider the qualify values.

What should I do in this situation ?

Many Thanks
Vino

4

Not to hijack your thread, but what is the reason an ISP would block SIP traffic? I would be absolutely furious if I paid my money for internet access and couldn’t have an IP phone…

5

I dont know why they do that…
But to help get customers out of it.

Hi IAN,

I’ll have a try on VPN Tunnel by tomorrow.
But, in what way does the content is being known by the ISP?

Many Thanks
Vino

6

Hi

Certain countries do this on a national level. and some ISPs who offer their own bundled service also block.

Ian