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Few Phones going in and out of SRST Mode

Having an issue were five phones at a remote location went in and out of SRST mode.  No hits on the WAN, and no issues with CUCM.  Looks like a LAN issue but, phones are on different switches.  Anyone experience this, any thoughts?

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Hall of Fame Cisco Employee

Few Phones going in and out of SRST Mode

Look at CUCM app logs for the disconnect reason from those phones.

They won't go to SRST unless the keekalives are not being acknowledged or the TCP link to CUCM is broken.

HTH

java

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www.cisco.com/go/pdihelpdesk

HTH

java

if this helps, please rate
Beginner

Re: Few Phones going in and out of SRST Mode

Hi,

 

Please let me know, in few locations our IP phones are going to "preservation mode". Once hangup it is resolving.

What is preservation mode ?

 

Thanks.

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