Legacy Cisco 7961 on SBC

[TLCtech]

Im deploying an old Cisco 7961 with an SBC and hosted PBX. Do I need to install the files mentioned in the instructions below on the SBC or the PBX?

https://www.3cx.com/sip-phones/cisco-7940g-7960g/

 

[Saqqara]

These phones do not support sbc - look at Limitations

https://www.3cx.com/sip-phones/cisco-7940g-7960g/

 

[SweetAction]

As a general FYI, template files are always on the PBX.

 

[JohnS_3CX]

Hi,

The support files are meant to be installed on your 3CX system in the folder indicated by the guide.

The phones are only supported in LAN mode though (no SBC or STUN).

If you want to use them you need to install 3CX locally on the same network as the phones.

 

[leejor]

It's been a while since set up a 7961. If this is a one-off you might be able to get it to work, if you don't mind spending some time doing so.

Create the configuration file, as if the set were being deployed locally. Manually edit the file, changing the server IP to that of the SBC. You may also have to change the IP of the set to match the range on the remote network. You would then have to put the file in a tftp server, and have the set upload it.Don't do this on the same network as the 3Cx server. Be certain to edit out any reference to uploading a configuration direct from 3CX. (It's been a while since I went over the configuration file)

Those steps should, in theory, work, but no guarantees. Getting them is implemented to be the tricky part. Unfortunately, those sets do not have a GUI.

If you insist on using an unsupported set, but one that is much easier to configure, look for a Cisco SPA525G.

 

[MikeHathaway]

The 7961 requires the files you download from 3cx to live on the TFTP server those files are the needed firmware files. The phone needs DHCP to point to your TFTP server whatever it is, that TFTP server always needs to be on and available when the phone boots up. 3cx will create a provisioning file sep<macaddress>.cnf.xml that file needs to be downloaded form the 3cx web interface when you provision the phone and placed on your TFTP server, that file is what programs you phone.
When the phone powers up, DHCP gives it the TFTP server, the TFTP server verifies and or loads the proper firmware, then feeds the .cnf.xml config file you copied over from the 3cx server. The phone then loads processes, takes its own sweet time then eventually pops up and starts working.

 

[leejor]

that TFTP server always needs to be on and available when the phone boots up.

Once provisioned, the phone seemed to be quite happy with the files it had previously downloaded, even after a re-boot. I didn't leave the tftp server on all the time.