Yealink T21PE2 User Manual

Phone Network
49
Keep Alive Configuration
Yealink IP 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 configures the type of keep-alive packets sent by the IP phone to the NAT device to keep the com-
munication port open so that NAT can continue to function.
Permitted
Values
0-Disabled
1-Default (the IP phone sends UDP packets to the server).
2-Options (the IP phone sends SIP OPTIONS packets to the server).
3-Notify (the IP 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 keep-alive interval (in seconds).
Example:
account.1.nat.udp_update_time = 30
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 T54S/T48S/T48G/T46S/T46G/T29G, X=1-16; for T52S/T42G/T42S, X=1-12; for T41P/T41S/T27G,
X=1-6; for T40P/T40G/T23P/T23G, X=1-3; for T21(P) E2, X=1-2; for T19(P) E2/CP920, X=1.
Rport Configuration
Yealink IP phones support rport described in RFC 3581. It allows a client to request that the server sends the response
back to the source port from which the request came.
Rport feature depends on support from a SIP server.
The following table lists the parameter you can use to configure rport.
Parameter
account.X.nat.rport
[1]
<MAC>.cfg
Description It enables or disables the NAT Rport feature.
Permitted
Values
0-Disabled
1-Enabled
2-Enable Direct Process
Default 0
Web UI Account->Advanced->RPort

Yealink T21PE2 Specifications

General

Brand	Yealink
Model	T21PE2
Category	IP Phone
Language	English