Yealink T54S

Troubleshooting
554
Permitted
Values
0-random source port (non 506x), fixed ports (506x) carried in the Contact, Via header.
1-random source port (non 506x) and other ports (non 506x) carried in the Contact,
Via header
Default
0
Parameter
sip.listen_mode
<y0000000000xx>.cfg
Description
It configures the listening mode.
Permitted
Values
0-according to the transport protocol
1-listening TCP and UDP
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
<y0000000000xx>.cfg
Description
It configures where the IP phone retrieves the destination address for response. The IP
phone will then send all SIP response messages to the destination address.
Permitted
Values
0-from VIA header in the request message
1-from source address of the request message
Default
1
Parameter
sip.requesturi.e164.addglobalprefix
<y0000000000xx>.cfg
Description
It enables or disables the IP phone to add a global prefix "+" to the E.164 user parts in
SIP: URI.
Permitted
Values
0-Disabled
1-Enabled, the IP phone will automatically add a prefix "+" to the number in the E.164
format when you dial using the SIP URI (for example, 862512345000@sip.com).
Default
0
Parameter
sip.send_keepalive_by_socket
<y0000000000xx>.cfg
Description
It enables or disables the IP phone to send the keep-alive packets based on the TCP
socket.
Permitted
Values
0-Disabled
1-Enabled
Default
1
Parameter
sip.sdp_early_answer_or_offer
<y0000000000xx>.cfg
Description
It enables or disables the IP phone to generate an SDP Offer or Answer message when
receiving a reliable provisional response or PRACK request and response.
Permitted
0-Disabled