Keep Alive Configuration; Rport Configuration - Yealink T5 Series Administrator's Manual

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
It configures the port of the STUN server.
Description
Note: It works only if "static.sip.nat_stun.enable" is set to 1 (Enabled).
Permitted
Integer from 1024 to 65535
Values
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
It sets the type of keep-alive packets sent by the phone to the NAT device to keep the communication
Description
port open so that NAT can continue to function.
0-Disabled
1-Default (the phone sends the corresponding packets according to the transport protocol)
Permitted
Values
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
It configures the interval (in seconds) at which the phone sends a keep-alive package.
Description
Note: It works only if "account.X.nat.udp_update_enable" is set to 1, 2 or 3.
Permitted
Integer from 15 to 2147483647
Values
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.
[2]
[1]
[1]
<y0000000000xx>.cfg
<MAC>.cfg
<MAC>.cfg
Phone Network
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