H3C Technologies H3C MSR 5600 - Manual (Page 16)

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 ."
For 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 after the CID detection, the
number of rings the FXO interface
receives before going off-hook.
cid ring { 0 | 1 | 2 } [ times ]
By default, CID detection is
performed between the first and
second rings, and the FXO
interface goes off-hook as soon
as the detection is complete (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.
As shown in
Figure 1 , Telephone A establishes a call to Telephone B, and then Telephone A goes on-hook.
The PBX plays the busy tone to Router A after detecting the on-hook condition of Telephone A. If Router
A cannot identify the played busy tone, the FXO interface on Router A will remain seized or fault
detection occurs. To solve this problem, you can configure busy tone detection for the FXO interface.