An ephone-dn in its simplest form is just a directory number that can be assigned to one or more buttons on one or more Cisco IP phones. You can configure each ephone-dn you create as either a single- or dual-line mode ephone-dn. Here's the difference:
1-Single-line ephone-dn: In single-line mode, the ephone-dn is only able to make or receive one call at a time. If a call arrives on an ephone-dn where there is already an active call, the caller will receive a busy signal
2-Dual-line ephone-dn: In dual-line mode, the ephone-dn is able to handle two simultaneous calls. This is useful for supporting features like call waiting, conference calling
Configuring Ephone-DNs
CME_Voice# config terminal
CME_Voice(config)# ephone-dn ?
<1-150> ephone-dn tag
CME_Voice(config)# ephone-dn 1
CME_Voice(config-ephone-dn)# number ?
CME_Voice(config-ephone-dn)# number 1000
CME_Voice(config-ephone-dn)# exit
CME_Voice(config)# ephone-dn 2 ?
CME_Voice(config)# ephone-dn 2 dual-line
CME_Voice(config-ephone-dn)# number 1001
The number syntax (which is used to assign a directory number to an ephone-dn) also supports a secondary number value. For example, you could enter
CME_Voice(config)#ephone-dn 2 dual-line
CME_Voice(config-ephone-dn)#number 1001 secondary 4805551001
This allows the ephone-dn to answer for multiple phone numbers. This could be useful if you wanted an internal extension to be reachable if someone on the internal network dialed a four-digit extension or the full PSTN Direct Inward Dial (DID) number.
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