Unable to call outbound certain numbers

[benjamin.leckie]

I am running Call Manager 11.5 with two CUBES into the telecoms network. When I try to call a certain company that also uses the same Telecom I get a 404 recording from call manager. I ran a debug with the Telecom provider and they saw that we are stripping the SDP from the INVITEs and getting a Cause Code 65 codec negotiation error. I'm stumped on what it could be. 

[b.winter · Accepted solution]

Hi,

CUCM or CUBE are not "stripping" the SDP in the INVITE, that's their default behaviour and is called delayed offer. (Maybe you should check the internet for the differences between delayed offer and early offer. That's a must-know basic knowledge)

To activate early offer on CUBE, you can use the command early-offer forced in global, tenant or dial-peer configuration.