Below is my Intelepeer Asterisk SIP trunk configuration. Intelepeer uses IP authentication so you do not need a username/password or registration string. I’ve test Intelepeer with Lync, cisco and asterisk.
host=68.68.124.55
type=friend
insecure=very
port=5060
context=from-pstn
dtmfmode=auto
nat=yes
canreinvite=yes
qualify=yes
allow=all
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