Multiple IP devices on a subnet

[calocsay]

There are two IP devices on a subnet. They're of the Mitel type, but it doesn't matter. The basic problem is that both extensions log on to the 3CX subcenter on port 5060. They can't call each other. Mobile extensions works, but I can't bring more than one IP device to life. With port forwarding, I can only direct port 5060 towards one device. What is the way that all IP devices can connect to the 5060 port and make calls work properly? Maybe the 3CX admin panel can help you with that?

 

[VasilisV_3CX]

Hi @calocsay,

Can you provide more information? https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/

What type of phones are you trying to connect? Where is the PBX in relation to the phones?

 

[cobaltit]

You seem to be confusing the port they connect to 3CX to with the port the device LISTENs on. You want to change the port the Mitel phone LISTENs on to a unique port along with the RTP range and forward. Or just use supported phones and the options to define that are in the template.

 

[calocsay]

Hi @calocsay,

Can you provide more information? https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/

What type of phones are you trying to connect? Where is the PBX in relation to the phones?

There are two phones. One is Mitel 6867i and the other is 6865i. Unfortunately, one of them does not have a STUN setting option. The 3CX itself is not on-premises, but is distributed from the Azure cloud.

 

[VasilisV_3CX]

@calocsay,

Since those phones are not supported, we do not know how they will behave, the best idea is to use supported IP phones.

 

[Osney Santos]

Mitel devices are not supported for STUN, however there is a way to configure them.

You must install a local SBC on the LAN and configure the Mitel device to use the SBC's IP as the SIP server in the device's browser configuration.

Here we use these devices that way we have an average of 5 to 6 Mitel 68XX devices working.

 

[calocsay]

Hi @calocsay,

Can you provide more information? https://www.3cx.com/community/threads/information-to-provide-when-requesting-help.67558/

What type of phones are you trying to connect? Where is the PBX in relation to the phones?

• 3CX Version: Annual 16.0.7.1078
• Server OS, ebian 9
• Is the 3CX Server Hosted and where? Hosted in Azure
• IP Phone Make/Model/Firmware: Mitel 6867i (FW:4.1.0.152) and Mitel 6865i (now is offline, i don't check it)
• Provisioning Method: Local / VPN / STUN / SBC : Local and manual
• Trunk Provider or Gateway Make/Model: ephone.hu
• Has the Firewall Checker passed: no firewall for client
• Are custom Phone Templates being used: NO

The ip device has never been automatically remotely configured even with supported devices. I have a grandstream 1625 device, I also set it up manually because it didn't go anywhere remotely.

 

[leejor]

As mentioned, each remote device, behind a router, must have a unique local SIP port, if not using VPN or an SBC. If a device does not have STUN, then , when registering with the PBX, it may use it's local IP and not the public IP of the router. If that is the case, then, unfortunately, it will not work. You can confirm this in the 3CX Activity Log.

 

[calocsay]

Mitel devices are not supported for STUN, however there is a way to configure them.

You must install a local SBC on the LAN and configure the Mitel device to use the SBC's IP as the SIP server in the device's browser configuration.

Here we use these devices that way we have an average of 5 to 6 Mitel 68XX devices working.

Thank you so much for your idea! I will advise the customer to obtain a supported device. If I'm right, is it okay for STUN supported devices to have multiple IP devices on the subnet at the same time?

 

[cobaltit]

Yes. The official supported requirement is unique SIP and RTP ports per device with port forwarding to the phones.

 

[leejor]

is it okay for STUN supported devices to have multiple IP devices on the subnet at the same time?

How well this works, and how complicated it has to be, depends on how many devices you are using. For two, maybe three, you might be able to get away with setting each extension option to "PBX delivers audio". and be good. The router used at the remote location can make a difference as well. Some handle this better than others. If you have more than a couple of phones there, you are best getting an SBC. The Raspberry Pi is not a big investment, but will make it much easier to add sets, if required, in the future.

 

[calocsay]

Mitel 6867i supports STUN server. Is it possible to replace the 6865i with a 6867i? Does the client still need to install SBC? With two phones, it may not be worth it. So the dilemma is to replace both phones with a supported phone, or is it enough to replace one with one that supports STUN?

 

[leejor]

Having STUN makes it more likely that the set will register correctly, (use the public IP rather than the LAN IP assigned to the device). It does not guarantee that there will not be any audio issues , in particular, between sets at that location. Usually that can be avoided using the PBX delivers audio option.

Again, that may work for a couple of sets, beyond that you may have to do some port forwarding.

 

[JohnS_3CX]

@calocsay you are already facing issues, so I would say that there is absolutely no point in wasting your time on this. You will probably end up spending your time to get those phones to work, only to find another problem down the line, and then another one and so on.

The recommended way to move forward is to do as my colleague suggested and buy phones that are in our supported list. This will be the easiest, most compatible way of getting your telephony, and these models have already been tested by us and the manufacturer to work great with 3CX.

Check the list here: https://www.3cx.com/sip-phones/

We also have apps for iOS, Android, Windows, and a web client if you wish to avoid phones altogether.