ISDN Overlap Dialing

Overlap dialing is a dialing scheme used by several ISDN variants to send and/or receive called number digits one after the other (or several at a time). This is in contrast to en-bloc dialing in which a complete number is sent in one message.

The device supports the following ISDN overlap dialing methods:

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Collects ISDN called party number digits and then sends the SIP INVITE to the IP side with the complete destination number (see Collecting ISDN Digits and Sending Complete Number in SIP)

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Interworks ISDN overlap dialing with SIP, according to RFC 3578 (see Interworking ISDN Overlap Dialing with SIP According to RFC 3578)