Direct SBC connections not via a Sonicwall Firewall

Possibly depending on the security capabilities of your SBC. The other thing to check on the Sonicwall is SIP-ALG and/or SIP inspection settings and toggle those to see if that allows it.

Hi Buckethead

The SBC is a Sangoma SBCT-CAR-250, Sangoma support is difficult to navigate :-(

Most of these 3rd party IP enabled devices do not run a hardened OS and would be possibly exploitable.

so no, not recommended. also see buckethead's comment about enabling the SIP ALG

Hi All,
I change the setting, the result was I was able to call in using MicroSIP but not with a Mobile or Landline, any ideas?

Thanks

can you make a drawing of your setup. and the settings on acl, nat and sip of the firewall.

Hi Benjamin

I will put the diagram up shortly , a little tied up at the moment being a virus hunter - if only I could rid of users :-)

Thanks

E.

When you say you were able to call in using MicroSIP, what are you using for Call Control? Does the SBC have that type of functionality or is it another server? I'm just trying to figure out what actually set up the call. It may not have traversed the SBC at all. Do you have public numbers coming in on a SIP trunk terminated to the SBC or did the provider of the SIP trunk provide you with test numbers?

@Buckethead  - I am not sure what you mean by call control, the calls come on IP (from Voxbone and others) via the Sonicwall into the Sangoma SBC and from there either into an IVR server with user prompts or it goes to our internal TDM switch via the PRI card in the SBC.
I am quite new into SIP configuration so it is a steep learning curve.


Regards

E.