For that you need the ABCL IP-Intercom firmware, if this is not loaded on your PS1, please download it from here and install it.
To stream to target 192.168.0.1 on port 3031 set as below on Configuration/Advanced Settings/Streaming.
The streaming is activate with button A (PTT).
On IO Command Interface fields there are also the settings to have button B flashing with streaming active.
On Configuration/Advanced Settings/Audio set as below.
With streaming active (PTT pressed) on Home page you've to see as below.
If you want to use Annuncicom PS1 as paging station together Instreamer as background music source for paging + BGM to Streaming Client or IP Former, configure PS1 as above and Instreamer as reported here.