Cisco Systems SPA9000 manual Ext Ip

SPA9000 Field Reference

Voice tab

B

Insert VIA rport	Inserts the rport parameter into the VIA header of SIP
	responses if the received-from IP and VIA sent-by IP values
	differ. Select yes or no from the drop-down menu.
	Default: no
Substitute VIA Addr	Lets you use NAT-mapped IP-address port values in the VIA
	header. Select yes or no from the drop-down menu.
	Default: no
Send Resp To Src Port	Sends responses to the request source port instead of the
	VIA sent-by port. Select yes or no from the drop-down menu.
	Default: no
STUN Enable	Enables the use of STUN to discover NAT mapping. Select
	yes or no from the drop-down menu.
	Default: no
STUN Test Enable	If the STUN Enable feature is enabled and a valid STUN
	server is available, the SPA9000 can perform a NAT-type
	discovery operation when it powers on. It contacts the
	configured STUN server, and the result of the discovery is
	reported in a Warning header in all subsequent REGISTER
	requests. If the SPA9000 detects asymmetric NAT or
	asymmetric firewall, NAT mapping is disabled.
	Default: no
STUN Server	IP address or fully-qualified domain name of the STUN server
	to contact for NAT mapping discovery.
	Default: blank
EXT IP	External IP address to substitute for the actual IP address of
	the SPA9000 in all outgoing SIP messages. If 0.0.0.0 is
	specified, or the field is left blank, no IP address substitution
	is performed.
	NOTE You must also configure port forwarding for SIP
	[5060-5063] and RTP [16384-16482] when using the EXT IP
	field, or phone users may experience one-way audio because
	the RTP stream will not find its way between the two phones.
	If this parameter is specified, the SPA9000 assumes this IP
	address when generating SIP messages and SDP (if NAT
	Mapping is enabled for that line). However, the results of
	STUN and VIA received parameter processing, if available,
	supersede this statically configured value.
	Default: blank

SPA9000 Voice System Administration Guide 211