Information Technology Reference
In-Depth Information
Example 6-1
Identifying Voice Ports Using show voice port summary
CME_Voice# show voice port summary
IN OUT
PORT CH SIG-TYPE ADMIN OPER STATUS STATUS EC
============== == ============ ===== ==== ======== ======== ==
0/0/0 — fxs-ls up dorm on-hook idle y
0/0/1 — fxs-ls up dorm on-hook idle y
0/2/0 — fxo-ls up dorm idle on-hook y
0/2/1 — fxo-ls up dorm idle on-hook y
0/2/2 — fxo-ls up dorm idle on-hook y
0/2/3 — fxo-ls up dorm idle on-hook y
Note: If you are using your router for Cisco Unified Communication Manager Express
(CME), each ephone-dn you configure shows up under the show voice port summary out-
put as an EXFS port.
Based on the output from Example 6-1, you can see that this router is equipped with two
FXS ports and four FXO ports.
FXS ports have three common areas of configuration:
Signaling
Call progress tones
Caller ID information
You can use two types of signaling for analog FXS interfaces: ground start and loop start.
The signal type dictates the method used by the attached device to signal that a phone is
going off-hook. Table 6-2 briefly describes the differences between ground start and loop
start signaling.
Table 6-2
Comparing Ground Start and Loop Start
Ground Start
Loop Start
Signals a new connection by grounding
two of the wires in the cable temporarily
Signals by completing a circuit (by lifting the
handset off-hook) and dropping the total DC
voltage down on the line
Must be configured
Is the default
Typically used when connecting to PBX
equipment
Typically used when connecting to analog de-
vices, such as telephones, fax machines, and
modems
You can use the syntax shown in Example 6-2 to set the signaling type on the voice port.
 
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