Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

Slow multicast through Cisco IP phone 6921.

I have to configure multicast (ghost) through unified ip phone 6921. Normally, the whole process should take like 30 to 60 minutes. With the computer behind the phone, it take 8 hours to be complete. Here what I tested :



·         Bypassed the phones. I remove the phones to make sure that the computers work correctly. This test was good. I got a normal speed.


·         I changed the phones for a 7962. The ghost take the expected time (30 to 60 minutes).


Does the 6921 supports multicasting? If the answer is yes, which firmware do we have to use to resolve this speed issue?


Thank you very much

Everyone's tags (1)
New Member

This discussion has been

This discussion has been reposted from Additional Communities to the Other Collaboration, Voice, and Video Subjects community.