sip.conf entries (global pedantic=yes is set):
[5461]
type=friend
secret=blah
host=dynamic
canreinvite=no
mailbox=5461
callerid=Adit 3104 L1 <5461>
context=emOrigInternal-Staff

[5462]
type=friend
secret=blah
host=dynamic
canreinvite=no
mailbox=5462
callerid=Adit 3104 L2 <5462>
context=emOrigInternal-Staff