Mitel 6863i

Would you like to operate on a Centro Business or on a Swisscom INternetbox?

With “external” SIP credentials you can see:

[https://www.swisscom.ch/de/privatkunden/hilfe/festnetz/sip-credentials.html#T=557bd047-68f0-4f83-88e1-1d719b26592e&TS=pH0-FYopTcn7Slk51W0HWoNdwBu8Xw4IghdINrXClR4] (https://www.swisscom.ch/de/privatkunden/hilfe/festnetz/sip-credentials.html#T=557bd047-68f0-4f83-88e1-1d719b26592e&TS=pH0-FYopTcn7Slk51W0HWoNdwBu8Xw4IghdINrXClR4)

With local SIP credentials on the Internet box you can see:

https://www.swisscom.ch/de/privatkunden/hilfe/festnetz/sip.html

EDIT:

I found this in the Digitec forum:

Compact instructions:

Swisscom (local IP telephony access data) -> Mitel (Line 1):
Login Name -> Authentication Name
Login password -> Password
Internal -> Phone Number
Private -> Screen Name
Remaining fields in Basic SIP Authentication Settings empty
Internal IP of the Swisscom router -> Proxy Server, Outbound Proxy Server, Registrar Server
5060 (port number) -> Proxy Port, Outbound Proxy Port, Registrar Port
3600 -> Registration Period
Remaining fields in Basic SIP Network Settings set to 0.0.0.0 or 0, Conference Server URI empty
Remaining fields at standard

My two Mitel phones work with this. I have two lines from Swisscom. Both phones ring when there are incoming calls on both numbers. They use the line light or ringtone to indicate which number is being called. I have defined 4 connections on the Swisscom router (a Anschluss for each telephone and each of my numbers). For outgoing calls you can choose which number you use to go out.

You can talk to each other internally, although that wasn’t a requirement.

[https://www.digitec.ch/de/s1/QuestionAndAnswer/will-this-phone-be-compatible-with-the-new-swisscom-internet-box-as-they-close-their-analogue-connec -70417] (https://www.digitec.ch/de/s1/QuestionAndAnswer/will-this-phone-be-compatible-with-the-new-swisscom-internet-box-as-they-close-their-analogue-connec -70417)