Yealink T5 Series Administrator's Guide

Phone Network
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Web UI Network->Advanced->NAT->STUN Server
Phone UI Settings->Advanced Settings (default password: admin) ->Network->NAT->STUN Server
Parameter
static.sip.nat_stun.port
[2]
<y0000000000xx>.cfg
Description
It configures the port of the STUN server.
Note: It works only if “static.sip.nat_stun.enable” is set to 1 (Enabled).
Permitted
Values
Integer from 1024 to 65535
Default 3478
Web UI Network->Advanced->NAT->STUN Port (1024~65535)
Phone UI Settings->Advanced Settings (default password: admin) ->Network->NAT->STUN Port
[1]
X is the account ID. For T58V/T58A/T56A, X=1-16; for CP960, X=1.
[2]
If you change this parameter, the phone will reboot to make the change take effect.
Keep Alive Configuration
Yealink phones can send keep-alive packets to the NAT device for keeping the communication port open.
The following table lists the parameters you can use to configure keep alive.
Parameter
account.X.nat.udp_update_enable
[1]
<MAC>.cfg
Description
It sets the type of keep-alive packets sent by the phone to the NAT device to keep the communication
port open so that NAT can continue to function.
Permitted
Values
0-Disabled
1-Default (the phone sends the corresponding packets according to the transport protocol)
2-Options (the phone sends SIP OPTIONS packets to the server)
3-Notify (the phone sends SIP NOTIFY packets to the server)
Default 1
Web UI Account->Advanced->Keep Alive Type
Parameter
account.X.nat.udp_update_time
[1]
<MAC>.cfg
Description
It configures the interval (in seconds) at which the phone sends a keep-alive package.
Note: It works only if “account.X.nat.udp_update_enable” is set to 1, 2 or 3.
Permitted
Values
Integer from 15 to 2147483647
Default 30
Web UI Account->Advanced->Keep Alive Interval(Seconds)
[1]
X is the account ID. For T58V/T58A/T56A, X=1-16; for CP960, X=1.
Rport Configuration
As described in RFC 3581, rport allows a client to request that the server sends the response back to the source IP
address and port from which the request originated. It helps the phone traverse symmetric NATs.

Yealink T5 Series Specifications

General

Brand	Yealink
Model	T5 Series
Category	IP Phone
Language	English