BLF/DSS key settings

[rpenrod]

We set this from our provisioning server; here's an example:

linekey.7.line = 1, where 1=sip account to use
linekey.7.value = 110

For your use case, you would set the above linekey.7.line value to whatever sip account you want to use. So, if you wish to use account 2, you would define the key as:

linekey.7.line = 2