Yealink SIP-T21 E2

Troubleshooting
1003
Source
Device
Source IP
Source Port
Destination
Device
Destination IP
Destination Port
(Listening port)
Protocol
Description of destination port
gateway
device.
TR-069
Server
IP address
of TR-069
Server
1024~65535
TCP
TR-069 protocol port, it is used
to communicate with TR-
069server.