# Trunking: Cisco Call Manager Express PBX (UC520/540/560)

Unfortunately, we don't have any documentation regarding the configuration of Cisco Call Manager Express UC520/540/560 PBXs. Instead, the following information should be useful for configuration:

* credentials - username XXXXXXt0 Password 7 xxxxxxxx realm sipconnect.sipgate.co.uk
* authentication - usernameXXXXXXt0 Password 7 xxxxxxxx realm sipconnect.sipgate.co.uk
* no remote-party-id
* retry invite 5
* retryregister 10
* timers connect 100
* registrar dns:sipconnect.sipgate.co.uk:5060 expires 600 (sec.)
* sip-server dns:sipconnect.sipgate.co.uk:5060

The Cisco PBX must send register requests to: sipconnect.sipgate.co.uk. IP addresses cannot be used in place of sipconnect.sipgate.co.uk. Cisco only supports numbers in the E.164 format (44123456789). The SIP ID lies outside of this range format.

**To ensure the SIP ID is always included in the SIP request, this must be done with Voice Class**

voice class sip-profiles 1 ➔ request ANY sip-header From modify "(<.\*:)(.\*@)" "\<SIP-ID>@" ➔ request REGISTER sip-header To modify "(<.\*:)(.\*@)" "\<SIP-ID>@"

**This Voice Class must then also be activated under**

voice service voip ➔ sip ➔ sip-profiles 1

With that the necessary header information is exchanged in real time and both SIP trunks and individual **numbers** should register.\
This requires firmware 15.2 (T2) and CME 8.1 or higher.