Intercom not working on main line CP 7821 SIP

[Marius33]

Hi everyone,

I have an ISR 4431 with CME 14.1 installed and I managed to get a intercom/trunk (hotline) working on a CP 6901 (SCCP) in telephony service, but i couldn't manage to get it on a CP 7821 (SIP) because i get the message " Can't configure intercom feature on the primary line of a phone". I want to pick-up the phone and get it to call a dispatch number but the 7821 SIP phone didn't work. Do you have any ideas why?

Thank you!

[Maren Mahoney]

SCCP and SIP phones operate very differently when it comes to dialing. I'm actually surprised you could set up the SCCP phone with an Intercom on Line 1, but wonders never cease with this system.

For the behavior you are describing, rather than Intercom you will want to set Line 1 as a PLAR/Hotline for the SIP Phone. If you need the target of the PLAR to go offhook when the PLAR is activated, you can set that DN to "Auto Answer with Speakerphone".

Configure CUCM Private Line Automatic Ring-down (PLAR) 

Maren