Yealink SIP-T2 Series, Administrator'S Manual

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Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
704
Parameters Permitted Values Default
Description:
Configures the maximum TCP port.
Note: The value of the maximum TCP port cannot be less than that of the minimum
TCP port. If you change this parameter, the IP phone will reboot to make the change
take effect.
Web User Interface:
Network->Advanced->TCP Port Scope
Phone User Interface:
None
To configure reserved ports via web user interface:
1. Click on Network->Advanced.
2. Enter the desired port scope in the UDP Port Scope field.
3. Enter the desired port scope in the TCP Port Scope field.
4. Click Confirm to accept the change.
A dialog box pops up to prompt that settings will take effect after a reboot.
5. Click OK to reboot the phone.
Network Address Translation (NAT) is essentially a translation table that maps public IP