Registering Sipura from remote location to Asterisk

[syscon]

Can anybody point or provide working configuration how to setup Sipura and Asterisk to register Sipura to Asterisk over the Internet. Both Sipura and Asterisk are behind firewalls.

I'll be force to use SIP as that is the only protocol that Sipura is using.
Do I need to enter any "STUN Server:" setting in "SIP" tab.

On Asterisk I think I only need to make changes in sip.conf isn't it?
What ports do I need to open on my firewall?

#Joseph

[mberlant]

Sipura devices work well with STUN (as long as the router they're behind is not Symmetric NAT), but Asterisk does not.

On the Asterisk's router you need to do two groups of things to make life smooth.

First, you need to either put your Asterisk in your router's DMZ or forward ports UDP 5060, UDP 10000-20000, UDP 4569, TCP 22 and (if you are using AMP or FOP) TCP 80 to the Asterisk's assigned FIXED LAN address.

Second, in sip.conf you need to set localnet= to match the LAN IP address range your Asterisk is a member of and externip= to your Asterisk's router's fixed IP address or dynamic DNS FQDN. If you have an IP address that changes often you will also need to reload sip.conf (via the "sip reload" command) every time your assigned public IP address changes. In my case I have two cron jobs that run every ten minutes. The first one, which runs on every minute that ends in 0, checks with my dyndns server to see what my current IP address is. The second one, which runs one minute later, issues a "sip reload" instruction to Asterisk. This forces Asterisk to resolve the FQDN once every ten minutes, reducing the time that remote clients cannot connect to a maximum of ten minutes. This procedure does not interrupt any calls in progress, so it is safe to perform as often as you feel necessary.

Good luck.

[tphank]

instead of using: externip=name.dyndns.org and extra code to reload/refresh, I found that you can use:

externhost=name.dyndns.org
externrefresh=10

where the externrefresh specifies how often the host name should be checked to be resolved!

Works great for me.

[syscon]

I've Symmetric NAT (Freesco) so STUN is not working, but NAT + Proxy is working OK but only directly Sipura to FWD (no need to make any changes to NAT). Asterisk SIP does not support Outbound Proxy so I had to connect my spare unit directly to FWD.

#Joseph

[mberlant]

tphank,

Thank you for "externrefresh=". I had no idea that parameter existed. The only thing I need to figure out now is how to (or if it is necessary to) synchronize the actual dyndns refresh with the externip refresh. As cron jobs, I have them running in succession every ten minutes, but maybe externrefresh=5 or the dyndns refresh every 5 minutes would be just as good.