Yealink SIP-T2 SERIES Administrator's Manual page 750

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Required ports for a SIP two-way call:
Call Type
Video
Voice
Each additional video participant requires 6 UDP ports.
Each additional audio participant requires 2 UDP ports.
The following table lists the number of UDP ports needed for the IP phone. This
information can help you to determine the range of port number to be entered in the
Reserved Port field.
Phone
SIP Three-way video call and two
VP-T49G audio call
Procedure
Reserved ports can be configured using the configuration files or locally.
Configuration File
Local
728
Number of Required Ports
6 UDP ports
2 UDP ports
Maximum Connections
<y0000000000xx>.cfg
Web User Interface
Required Ports for a SIP
Call
16 UDP 50000-50015
Configure the range of the
UDP ports.
Parameters:
sip.min_udp_port
sip.max_udp_port
Configure the range of the TCP
ports.
Parameters:
sip.min_tcp_port
sip.max_tcp_port
Configure the range of the
UDP ports.
Configure the range of the TCP
ports.
Navigate to:
http://<phoneIPAddress>/serv
let?m=mod_data&p=network
-adv&q=load