When using Skype for SIP trunks with Asterisk a simple an neat way to enable DDI calling for the skype names is to use the “extension” option.
This means that the ‘To’ in in the sip header is set to what you set.
This can then be picked out with a simple little bit of dialplan
exten => 99051000000000,1,Set(CALLERID(num)=${CALLERID(name)})
exten => 99051000000000,2,Set(cNum=${SIP_HEADER(TO):5:6})
exten => 99051000000000,3,Noop(${cNum})
exten => 99051000000000,4,Goto(from-pstn,${cNum}|1)
In the above example we have 6 digit ddi numbers in the context from-pstn.
Setting up the Skype end is as simple as logging into your BCP and then the relevent profile and clicking on the calling tab
and setting as below
This lets you now use one account and have all your BCP accounts have DDI calls directed at the PBX