Cisco SIP Phone conference not working after update firmware on Asterisk

Hi Everyone,

Good day!..

I would be really appreciate you as you already configured Cisco 79xx series phones with CONFERENCES, recently we have implemented asterisk and we have configured 7962,7931 Cisco Phone SIP firmware via TFTP everything are working fine except conferences.

My humble request you to all that could you please help me out on this.

Please waiting for your kind response.

Thank you in Advance.

You haven’t provided enough information - such as how they are connecting to Asterisk. Are they using SIP? Are they using SCCP?

Jcolp Thank you for your reply.

I am using SIP firmware on the following cisco phone model.
All are connected and working fine just not working on conference.
6921, 7962, 7931, 3905.