Aastra 9143i Series Administrator's Manual page 1071

# NAT device between the server and the phone, then you must set the
# following two parameters for the phone to function correctly.
#sip nortel nat support: 1
#sip nortel nat timer: 60
# Option 2:
#
# If you are using a session border controller, you should set the
# outbound proxy to the session border controller address
#sip outbound proxy: sbc.aastra.com
#sip outbound proxy port: 0
# Option 3:
#
# If you know the public IP address of your NAT device and and have
# opened up a port for the SIP messages then you can statically
# assign this information.
#sip nat ip: 67.123.122.90
#sip nat port: 5890
# Additional Network Settings
# =============================
#sip rtp port: 3000
#-------------------------------------------------------------------
# Configuration Server Settings
41-001160-04 Rev 02, Release 2.5
# 1 = enabled
# seconds between keep alive messages
# a value of 0 enables SRV
# lookups for the address of
# the proxy.
# Eg. RTP packets are sent to port 3000.
Sample Configuration Files
C-5