Cisco ATA186-I1 Administrator's Manual page 153

Chapter 8 Troubleshooting
Table 8-6
Ring Load (per RJ-11 FXS Port)
2 REN
1 REN
Cisco ATA, however, is not designed for long-distance usage. The simple test is to determine if the
phone or phones that are connected to the Cisco ATA work properly in their environment.
Pay attention to the following questions:
1. Can the Cisco ATA detect on/off hook from the analog phone?
2. Can the Cisco ATA detect the DTMF signal?
3. Can you dial the remote side?
Can the Cisco ATA ring the phone?
4.
Is voice quality satisfactory?
5.
If you answer no to any of the above questions, you may have a loop impedance greater than 400 ohm.
In this case, perform the following procedure.
Procedure
Step 1 Increase the wire gauge to reduce the impedance until the Cisco ATA can detect on/off hook and DTMF
signal.
Step 2 If the Cisco ATA cannot ring the phone, find a phone that can ring at a lower ringing voltage. Also, try
to use only one phone instead of multiple phones in parallel.
Does the Cisco ATA support network address translation (NAT) when it is loaded with an SCCP
Q.
image?
No, NAT is not supported by the Cisco ATA with the SCCP image.
A.
Q. Can I change the RTP frame size of voice codecs for the Cisco ATA when using with SCCP image?
Yes. The RTP frame size is controlled by the Cisco CallManager when the Cisco ATA uses the
A.
SCCP image. To change the RTP frame size for a voice codec, follows the steps below:
Procedure
Step 1 Open your web browser
Step 2 Access the CallManager administration page:
http://<IP address>/ccmadmin
From the Service menu, select Service Parameters.
Step 3
From the Server drop-down list, select the Cisco CallManager for the Cisco ATA.
Step 4
From the Service drop-down list, select Cisco CallManager.
Step 5
OL-4652-01
Ring Loads and Distances (continued)
Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for SCCP (version 3.0)
Frequently Asked Questions
Maximum Distance
2500 feet (762 m)
3200 feet (975 m)
8-15