No ringback for incomming call in CUBE

[dgonzalez1]

Hello, I'm troubloshooting an issue where there is no ringback for incoming calls. The callflow is:

PSTN -->(SIP)--> CUBE --> IVR --> (Enter extension XXXX) ---> CUCM ---> (Extension XXXX)

While the extension is ringing there is no ringback for the caller. A 180 ringging is sent to the pstn when the IVR takes the call, and when the call is sent to the extension the CUCM sends a 180 to the CUBE but it is not retransmited to the PSTN (I supposse because it already received one before, right?). Instead, a Re-Invite with SDP is sent to the caller. Is that correct? In any case, ringback is not playing. I can attach the call diagram:

Thank you.

[joshuarg1]

hello how are you doing is correct the re.invite that sends the Cube to PSTN is because it has it on hold should be an update and this can send the cucm or configure the Cube to send the update.