Cisco ATA-186 Administration Guide - Page 142

Debugging the Cisco ATA 186/188 Fax Services Chapter 7 Configuring and Debugging Fax Services Table 7-2 Debug Log Examples Log event Description [ch] Enable encoder Voice encoder type pt is enabled for the channel ch, where pt can be 0 for G.711µ-law, 4 for G.723.1, 8 for G.711A-law, and 18 for G.729. For example, [0]Enable encoder 4 indicates that the Cisco ATA transmitted G.723.1-encoded voice packets. [ch] DPKT 1st: , pt The first voice packet that the Cisco ATA received was of RTP payload type pt for the channel ch with timestamp of timestamp1, and the local decoding timestamp was set to timestamp2. For example, [0]DPKT 1st: 1491513359 1491512639, pt 4 indicates that the first RTP packet that the Cisco ATA received was G.723.1-encoded for channel 0. [ch] codec: => Voice codec switchover occurred. The voice encoder type switched from pt1 to pt2 for the channel ch. For example, [0]codec: 4 => 0 indicates that the local voice encoder on the Cisco ATA switched from G.723.1 to G.711µ-law. [ch] Rx MPT PT= Channel ch received an NSE packet of event with payload type of NSEpt. NSE pkt For event, c0XXXXXX indicates a CED tone event, and c1XXXXXX indicates a phase reversal event. For example, [0]Rx MPT PT=100 NSE pkt c0000000 indicates that the Cisco ATA received a CED tone event NSE packet with payload type of 100. [ch] Tx MPT PT= NSE Channel ch transmitted an NSE packet of event with payload type of pkt NSEpt. For event, c0XXXXXX indicates a CED tone event, and c1XXXXXX indicates a phase reversal event. For example, [0]Tx MPT PT=100 NSE pkt c0000000 indicates that the ATA transmitted a CED tone event NSE packet with payload type of 100. Debugging FAX Pass-through Mode When the Cisco ATA is configured to use fax pass-through mode, the fax call session can be established with an arbitrary voice codec. Once the voice call has been established, fax machines can signal their presence by means of a CED tone or V.21 preamble flag, after which the gateways send NSE packets to initiate switchover. Note For fax pass-through mode, check the Cisco ATA debug log to verify that it is acting as an originating gateway as well as a terminating gateway. Terminating-Gateway Example When the Cisco ATA is used as a terminating gateway for a fax session, make sure the following conditions are true: • The Cisco ATA transmits CED-tone-event NSE packets. • The encoder switchover to G.711 occurs during the NSE-packet transaction. 7-10 Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SIP) OL-3410-01