R0106-HP MSR Router Series Voice Configuration Guide(V7)

6
Configuring an FXO interface
This section covers the procedures for configuring an FXO interface.
Configuring CID
The CID function must be configured on both the FXS and FXO interfaces. For information about
configuring this function on the FXS interface, see "Configuring CID."
Fo
r the CID function to work correctly, enable both CID receiving and CID sending.
Enabling CID receiving for an FXO interface
The FXO interface receives the CID. By default, it detects the CID from the PBX between the first and
second rings.
To enable CID receiving:
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter FXO interface view.
subscriber-line line-number N/A
3. Configure the time for CID detection and
the number of rings the FXO interface
receives before going off-hook.
cid ring { 0 | 1 | 2 } [ times ]
By default, an FXO interface
performs CID detection
between the first and second
rings, and it goes off-hook as
soon as finishing the detection
(cid ring 1 0).
4. Enable CID receiving for the FXO
interface.
cid receive
By default, this function is
enabled.
Enabling CID sending for an FXO interface
Step Command Remarks
1. Enter system view.
system-view N/A
2. Enter FXO interface view.
subscriber-line line-number N/A
3. Enable CID sending for the FXO
interface.
cid send
By default, this function is
enabled.
Configuring busy tone detection
PBX switches might use different busy tone standards. If a user on the PBX side hangs up, the router knows
the on-hook operation by detecting a busy tone. If the router A cannot correctly identify the played busy
tones, the FXO interface on Router A will remain seized or goes on-hook prematurely.
As shown in Figure 1, T
elephone A establishes a call to Telephone B
, and then Telephone A goes on-hook.
The PBX plays busy tones to Router A after detecting the on-hook condition of Telephone A. If Router A
cannot detect the played busy tones, the FXO interface on Router A will remain seized. To solve this
problem, you can configure busy tone detection for the FXO interface.