SIP Registration timer

[comms-care]

I have a customer who is experiencing calls drops to their SIP circuit. They have CME running on a UC520.

I ran debug ccsip messages and could see an expiry time of 180s however the CME is configured with:

sip
  registrar server expires max 3600 min 3600

Should these timers match? 

Many thanks.

[Hythim Ali El Hadad]

try this

voice service voip

sip

reset timer expires 180

[moyo oyegunle · Accepted solution]

Hello 

You probably don't want them to match

The registrar server expires command sets the minimum and maximum time for registration. SIP does not use keepalives so phones have to re-register meaning the a phone must not send a register request 3600 sec(If min is set to 3600) from its last request and must send a register request before 3600 seconds from it's last request. Can cause a lot of issues if set wrong.You probably want Min to be around 1800(CUCM uses 1800 by default) or 1200