Yealink SIP-T2 Series Administrator's Manual page 516

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
Values 1-Enabled. If the To-tag does not exist, the IP phone will reject the request.
Default 0
Parameter features.call_invite_format
Description It configures the format of callee field in the INVITE message.
0-sip:XXX
Permitted
Values
1-tel:Number, you need to set "account.X.outbound_proxy_enable" to 1.
Default 0
Parameter sip.escape_characters.enable
Description It enables or disables the IP phone to convert ASCII characters.
Permitted 0-Disabled
Values 1-Enabled
Default 0
Parameter sip.tcp_port_random_mode
Description It configures the listening port mode.
0-random source port (non 506x), fixed ports (506x) carried in the Contact, Via header.
Permitted
Values
1-random source port (non 506x) and other ports (non 506x) carried in the Contact, Via header.
Default 0
Parameter sip.listen_mode
Description It configures the listening mode.
0-according to the transport protocol
Permitted
1-listening TCP and UDP
Values
2-listening TCP and UDP, and subscribe for BLF List containing transport=TCP in the Contact header.
Default 0
Parameter sip.send_response_by_request
It configures where the IP phone retrieves the destination address for response. The IP phone will then
Description
send all SIP response messages to the destination address.
0-from VIA header in the request message
Permitted
Values
1-from source address of the request message
Default 1
Parameter sip.requesturi.e164.addglobalprefix
Description It enables or disables the IP phone to add a global prefix "+" to the E.164 user parts in SIP: URI.
0-Disabled
Permitted
1-Enabled, the IP phone will automatically add a prefix "+" to the number in the E.164 format when you
Values
dial using the SIP URI (for example, 862512345000@sip.com).
Default 0
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