From the manual: Section 3.5 Intercom Caller Controlled Signaling

Description
You can change the signaling mode of an Intercom (ICM) call from Tone ring to Voice announce
or Voice announce to Tone ring.
Operation
iPECS IP & LDP Phones
To change the ICM Signaling mode;
1. Place your intercom call as normal.
2. Dial “#”, the ICM Signaling mode will change from Voice announce to Tone ring or Tone
ring to Voice announce.


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