Cisco IP Phone 88XX series time is 3 seconds faster than SCCP phones. Why?

[micparke]

The time on our Cisco SIP phones (88XX) is 3 seconds faster than our SCCP phones. Any Guidance would be highly appreciated.

Thanks in Advance!

micparke

[Deepak Mehta]

Are you talking about dialing ,the call gets connected much faster or accessing the menu options?

to which phones models are you comparing to?

Regards,

[micparke]

Hello Deepak,

I am referring to the Time on the phones. The time on the SIP phone is changing 3 seconds earlier than our SCCP phones. The SCCP phones are changing at the same time as our NTP while the SIP phones are 3 seconds earlier. Sorry for the confusion.

Micparke

[Deepak Rawat · Accepted solution]

Please try defining the Phone NTP Reference in the Date/Time Group for SIP phones and see if it helps.

About phone NTP reference setup

In Cisco Unified Communications Manager Administration, use the System > Phone NTP Reference menu path to configure phone NTP references.

If you want to do so, you can configure phone Network Time Protocol (NTP) references in Cisco Unified Communications Manager Administration to ensure that a phone that is running SIP gets its date and time from the NTP server. If all NTP servers do not respond, the phone that is running SIP uses the date header in the 200 OK response to the REGISTER message for the date and time.

After you add the phone NTP reference to Cisco Unified Communications Manager Administration, you must add it to a date/time group. In the date/time group, you prioritize the phone NTP references, starting with the first server that you want the phone to contact.

The date/time group configuration gets specified in the device pool, and the device pool gets specified on the phone page.

Phone NTP references setup tips

After you add a new phone NTP reference to the Cisco Unified Communications Manager database, assign it to a date/time group.


Regards

Deepak

[micparke]

Hello Deepak,

Thank you for the information. Your recommendation solved my issue.

Regards,

Michael P.

[Deepak Rawat · Accepted solution]

Glad that it helped Michael. Please remember to mark the thread as Answered if there are no further questions on the topic

Regards

Deepak