topic Re: SIP trunk with 3rd party IP pbx server in IP Telephony and Phones

SIP trunk with 3rd party IP pbx server

Nizam.Ahmed — Wed, 08 May 2019 10:45:05 GMT

Hi Expert,

Could not establish call between cucm and 3rd party IP pbx.

I've configured SIP trunk, Route pattern in CUCM and also configured in sip trunk and dial plan in another pbx side.

now while i am trying to call from my CIPC to another 3rd party pbx phone but i found a message from rtmt as below

"SIP/2.0 401 Unauthorized".

Please suggest me the way out.

Nizam

Carlo Poggiarelli — Wed, 08 May 2019 11:47:33 GMT

Hi Nizam,

Most of times depends on third party PBX trunk configuration.

In case of asterisk, make sure they configured the following parameters:

type=peer
host=your cucm IP
insecure=very
nat=no
disallow=all
allow=ulaw

HTH

Regards

Carlo