Incoming SIP calls ITSP have 2 second delay before audio cut-through

[dino55088]

hi,

have ITSP-CUBE-CUCM (mtp required)- uccx agent

Incoming calls from ITSP have a slight 1-2 second before audio cut thru to uccx agent. External caller cannot hear our agents say "hello welcome to company xyz""

I believe this may be related to PRACK but i am not sure where I should enable it. On CUCM sip profile?

[Leonardo Santana]

Hello,

To enable PRACK check this link:

https://www.cisco.com/c/en/us/support/docs/voice/session-initiation-protocol-sip/116086-configure-cube-cucm-sip-00.pdf

When you call to your IVR the PSTN user cannot hear the audio of IVR?

Regards

Leonardo Santana

[dino55088]

hi Leonardo,

thanks for the doc link.

Yes the users can eventually hear one other but there is like a 2 second delay from the time the internal user/agent answers the call to the time audio is heard at the exernal party.

i.e. the internal user/agent has to repeat their greetiting or wait a second or 2 before saying hello.

I am just unsure which call leg i should enable PRACK

[Leonardo Santana]

Do you have early media enabled at CUBE or at ITSP side?

Regards

Leonardo Santana

[dino55088]

ITSP sends us SIP EO inbound