Unsupported Provisioning Cisco 7821 with Direct STUN/SIP

[khoiusa]

Hello, I recently purchased a Cisco 7821, and was wondering if you could provision using Direct STUN/SIP since I think using a SBC isn't for me since I might be moving the Cisco 7821 outside of my network. Does anyone have any solutions to this?

 

[SweetAction]

Technically you could make it work in direct SIP mode, but it's not on the supported phone list so it's not supported.

This link will detail the basic steps: https://www.3cx.com/community/threa...-phone-how-can-i-make-it-work-with-3cx.84739/

Don't forget to make sure WAN is on / not blocked and 5060 is forwarded to the PBX.

I don't think that phone has a webui so you would need to write a config and serve it up to the phone via tftp no matter where it is. You could likely set it up as a 79xx series phone in 3CX and use that config as a base with some minor tweaks. And you will likely need to have control over the DHCP server wherever the phone is.

You said you recently purchased this phone - could you return it and get a supported model?

 

[khoiusa]

I think it will work with the 3CX system since I've seen someone on YouTube get it up and running.

 

[khoiusa]

I know that the Cisco 7841 and 7821 are VERY similar, I watched this video:

and the Cisco 7841 does have a web interface. If it does not have a web interface, I think I will be able to configure it with TFTP server XML files like you said, a bit more complicated, but I think will work. Also, if the Cisco 7821 does have a web interface, I will try to set it up with the SIP Server, auth ID, and auth password. I'll get in contact back when I run into any problems.

 

[ChrisC_3CX]

Just want to say that as @SweetAction already mentioned this is not a Supported IP Phone so if switching to one is still an option I would recommend doing so. That way, not only will you be eligible for 3CX Support should you ever need it, but also, provisioning and maintaining the device will be a breeze.