Skip2PBX has been successfully tested with Cisco CallManager 4.1 with theconfiguration following :

1. Configure your Cisco CallManager Trunk:

Use following values to configure your trunk.

Device Name	Your Skip2PBX IP
Description	Skip2PBX
Media Termination Point Required	checked
Destination Address	Your Skip2PBX IP
Destination Address is an SRV	unchecked
Destination Port	5060
Incoming Port	5061
Outgoing Transport Type	UDP
Preferred Originating Codec	711ulaw

2. Configure your Skip2PBX to accept trunking from your Cisco CallManager

Open your Skip2PBX web interface and go in Channels > SIP > SIP trunks and  create a new trunk with following specs:

Authentication mode	Based on IP (trusted)
Link mode	PBX
Username	ccm
Remote Side IP	your asterisk IP
Remote side port	5060
DTMF Mode	RFC2833

3. Configure your Skip2PBX routes

Open your Skip2PBX web interface and go in Call routes > Inbound calls or Call routes > Outbound calls and define routes depending on your preferences.

Default outbound route works for 99% of configurations.

PLEASE NOTE: For incoming calls you may need to specify an extension number to route call to.