Rauland Td21 And 1100 - Telecenter 1100 System Operation 电路图.pdf

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RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 Telecenter 1100 Intercom Operations Dial, Busy, and Disallow Tones Normally, picking up the handset of an administrative phone should cause dial tone (a steady, fixed-frequency tone) to sound in the earpiece. If the 2524s front-panel keys are in use, the handset will sound a busy signal (a series of short “beeps”). Finally, if the user dials an invalid number, the handset will sound double, “disallow” beeps.