Cannot make internal calls while in SRST

[Falco_Lombardi]

Cannot make internal calls while in SRST.

We pulled the WAN cable at a site and the phones at that site could not call each other by extension. Phones sitting right next to each other. Will attach router config, must have configured something wrong.

Cisco ISR 4351

Cisco Unified CM Administration System version: 12.5.1.11900-146

[Roger Kallberg]

Looks like you’re using SIP SRTS? For SIP phones to be able to call each other in SRST you need to enable Cube function in the gateway. Add this to your configuration.

voice service voip

allow-connection sip to sip