Polycom SpectraLink 8030 - Manual (Page 71)

Programming the SIP Handset Features
PN: 1725-36038-001_E.doc 71
#(8020/8030 phones ignore this parameter if present no matter the SW version)
#PROXY1_REREG_SECS=3600
#-----------------------------------------------------------------------------------------#
# PROXYn_CALLID_PER_LINE controls sending of same Call-ID header
# field for registrations sent to a particular registrar."
# If this is enable we will send Call-ID headers differently.
# This may be needed for Mitel 3300 Controller software prior to Release 9
#PROXYn_CALLID_PER_LINE = enable