Panasonic KX-TGP600 Administrator's Manual page 324

6.6.2 Pairing (Parallel Mode) Settings
Note
The ID number of the master desk phone is 6, so set PARALLEL_HSNO6 and PARALLEL_MODE6.
<Pairing Group 4 Settings>
Handset 7 is paired as the master desk phone
together with Handset 8.
Operation mode: Busy
Note
The ID number of the master desk phone is 7, so set PARALLEL_HSNO7 and PARALLEL_MODE7.
2.
Setting using the Web user interface (administrators only)
See 4.4.8 Parallel Mode Settings for making settings using the Web user interface.
Note
"Master Desk Phone Number" refers to the ID number of the master desk phone (KX-TPA65).
"Slave Handset Number" is set to the ID number of the slave handset (KX-TPA60).
324 Administrator Guide
Configuration Parameter Setting
PARALLEL_HSNO7="8"
PARALLEL_MODE7="0"
Document Version 2015-02