Yealink SIP-T5 Series Administrator's Manual page 533

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
Result: The target characters %5F remain the same.
Parameter sip.reserve_characters
It specifies the characters that the phone does not recognize as the escape one.
Description
Multiple characters are not separated.
Permitted
String
Values
Default Blank
Supported
All phones except T48G, T46G, T42G, T41P and T29G
Devices
Related
sip.escape_characters.enable
Parameters
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 1
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 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 phone to add a global prefix "+" to the E.164 user parts in SIP: URI.
0-Disabled
Permitted
1-Enabled, the 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
Parameter sip.send_keepalive_by_socket
It enables or disables the phone to send the keep-alive packets based on the transport protocol.
Description
Note: It works only if "account.X.nat.udp_update_enable" is set to 1 (Default).
0-Disabled, the phone sends the keep-alive packets based on the account
Permitted
Values
1-Enabled
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