This file is indexed.

/etc/smsclient/sms_modem is in smsclient 2.0.8z-10.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# --------------------------------------------------------------------
# SMS Modem Configuration file
# --------------------------------------------------------------------

{
	# ------------------------------------------------------------

	MDM_lock_dir 	       = "/var/lock"	# Lock directory
	MDM_device	       = "ttyS0"	# Modem Device Name

	# Modem Device Name Examples: 
	# 
	# MDM_device = "term/00m"      	# UNIXWARE
	# MDM_device = "ttyS0"         	# Linux COM1
	# MDM_device = "ttyS1"         	# Linux COM2
	#
	# MDM_device        = "cua/a" 	# SOLARIS
	# MDM_lock_platform = "SOLARIS"	# Set this so that we generate
					# Solaris compatible lock file
					# names

	# ------------------------------------------------------------

	# MDM_pause_after_connect = 3000000	# Pause after the connection
						# string for 3 seconds

	# ------------------------------------------------------------

	MDM_command_prefix     = "AT"
	MDM_init_command       = "Z"
	MDM_dial_command       = "DT"
	MDM_number_prefix      = ""		# Number to dial to get an 
						# external line. 


	MDM_set_local_echo_off = "E0"
	MDM_disable_echo_test  = NO		# Test and Set local echo
						# YES/NO

	# ------------------------------------------------------------

	MDM_dtr_hangup_sleep   = 3000000 	# How many microseconds should
	MDM_dtr_init_sleep     = 1000000 	# I lower DTR during
						# init/hangup

	# ------------------------------------------------------------

	MDM_command_suffix     = "\r"
	MDM_response_prefix    = "\r\n"
	MDM_response_suffix    = "\r\n"

	# ------------------------------------------------------------

	MDM_flow_control       = "Hardware"	# Software or Hardware

	# ------------------------------------------------------------

	MDM_hangup_command      = "H"
	MDM_attention_command   = "+++"
	MDM_soft_hangup_retries = 0		# Number of times I should
						# continue sending hangup code
						# If 0 then don't bother
						# and rely on lowering DTR

	MDM_guard_time          = 1750000	# Microsecond delay before and
						# After transmitting attention command
	MDM_esc_time	        = 125000	# Microsecond delay between each
						# character of the attention command

	# ------------------------------------------------------------

	MDM_lock_action		= "BLOCK"
	MDM_lock_retry_delay	= 5000000	# Microsecond delay to wait before
						# retrying for modem lock.

}

# --------------------------------------------------------------------