/etc/asterisk/pjsip.endpoint.conf:
[2268]
type=endpoint
aors=2268
auth=2268-auth
tos_audio=ef
tos_video=af41
cos_audio=5
cos_video=4
allow=ulaw,alaw,gsm,g726,g722
context=from-internal
dtmf_mode=rfc4733
mailboxes=2268@device
mwi_subscribe_replaces_unsolicited=yes
aggregate_mwi=yes
use_avpf=no
rtcp_mux=no
ice_support=no
media_use_received_transport=no
trust_id_inbound=yes
media_encryption=no
timers=yes
outbound_proxy=sip:10.30.100.43:5060\;lr
media_encryption_optimistic=no
send_pai=yes
rtp_symmetric=yes
rewrite_contact=yes
force_rport=no
media_address=10.30.100.37
bind_rtp_to_media_address=yes
language=en
one_touch_recording=on
record_on_feature=apprecord
record_off_feature=apprecord

/etc/asterisk/pjsip.aor_custom.conf:
[2268]
type=aor
mailboxes=2268@device
max_contacts=1
remove_existing=yes
maximum_expiration=7200
minimum_expiration=60
qualify_frequency=60
outbound_proxy=sip:10.30.100.43:5060\;lr

/etc/asterisk/pjsip.registration_custom.conf:
[2268]
type = registration
outbound_proxy = sip:10.30.100.43\;lr