Cisco ATA-186 Administration Guide - Page 140

Debugging the Cisco ATA 186/188 Fax Services Chapter 7 Configuring and Debugging Fax Services Table 7-1 Solving Common Fax Problems Problem Action The far-end gateway is not loaded with correct software image. Cisco recommends IOS version 12.2 (11)T or higher for the Cisco 2600 and Cisco 3600, and IOS version 12.1 (3)T or higher for Cisco AS5300. The Cisco 6608 supports both the NSE and NTE methods of fax pass-through mode, beginning with software version D004030145S16608. To use fax pass-through mode with the Cisco 6608, the user must select 6608 NSE mode, and the NSE payload type must be reconfigured to match the Cisco ATA. The Cisco ATA is not loaded with the proper software. Cisco recommends using software version 2.14 or higher. User is operating Cisco recommends using Cisco ATA models 186-I1, 186-I2, 188-I1, or Cisco ATA software on an 188-I2 (hardware platforms). outdated model. The Cisco ATA is not For fax mode, the AudioMode configuration parameter should be set to configured for fax mode or 0xXXXX0012 (X = value not applicable) for the Phone 1 port of the fax pass-through mode. Cisco ATA, and 0x0012XXXX for the Phone 2 port. For fax pass-through mode, AudioMode should be set to 0xXXXX0015 for the Phone 1 port of the Cisco ATA, and 0x0015XXXX for the Phone 2 port. The remote gateway is not When the Cisco ATA is configured for fax pass-through mode, all remote configured for modem/fax gateways must be configured with modem/fax pass-through mode either pass-through mode. on a dial-peer level or system level. Fax relay is not disabled on the remote gateway. Fax relay is enabled by default on some Cisco gateways. When fax relay is enabled, it can override fax pass-through mode and cause fax failure. Examples of the CLI commands to disable fax relay for IOS gateways are as follows: • fax rate disable for H.323/SIP gateways • mgcp fax t38 inhibit for MGCP gateways Fax/modem pass-through method on the remote gateway is not compatible with the Cisco NSE-based method. Some Cisco gateways (such as Cisco VG248, and Cisco 6608) may use signaling messages based on RFC2833 for G.711 upspeed when loaded with older software images. This method is incompatible with the Cisco NSE-based method. You must check to make sure that the image on your gateway supports the Cisco NSE-based fax/modem pass-through. Otherwise, you must configure the Cisco ATA to use fax mode. NSE payload types differ between gateways. The Cisco ATA has a configurable NSE packet payload-type value whose default is 100. This value is compatible with the implementations of most Cisco gateways. However, some Cisco gateways use 101 as the NSE payload type. Ensure that all gateways in your environment use the same NSE payload type if you wish to successfully use fax pass-through mode. Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SIP) 7-8 OL-3410-01