Cisco ATA-186 Administration Guide - Page 151
rtpcatch Limitations, Analysis, Possible Cause for Failure
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Chapter 7 Configuring and Debugging Fax Services Debugging the Cisco ATA 186/188 Fax Services Example 7-9 Fax Pass-through Mode Failure ---------- FAX Summary 1 ---------[ 37]3.200> Codec G723 [ 39]2.53> Codec G723 [ 143]2.53> Codec G711u/D [ 144]2.53> NSE PT 100, EVT 192: Up-Speed, CED tone Detected [ 1602]2.53> NSE PT 100, EVT 192: Up-Speed, CED tone Detected [ 1604]3.200> Codec G711u/D [ 1820]3.200> NSE PT 96, Cisco Fax Relay [ 1966]3.200> NSE PT 96, Cisco Fax Relay Analysis • is the originating gateway, and is the terminating Cisco ATA. • The Cisco ATA upspeeds to G.711µ-law and sends G.711 upspeed NSE signaling packets. • The gateway upspeeds to G.711µ-law and then sends Cisco fax relay event packets. Possible Cause for Failure • Cisco fax relay option is not disabled on the gateway. Example 7-10 Fax Pass-through Mode Failure ---------- FAX Summary 1 ---------[ 33]2.53> Codec G729 [ 39]3.200> Codec G729 [ 562]3.200> NTE PT 101, EVT [ 563]3.200> NTE PT 101, EVT [ 565]3.200> NTE PT 101, EVT [ 566]3.200> Codec G711u/D [ 568]3.200> NTE PT 101, EVT [ 580]2.53> Codec G711u/D 34: Modem Mode, ANSam tone Detected (RFC2833) 34: Modem Mode, ANSam tone Detected (RFC2833) 34: Modem Mode, ANSam tone Detected (RFC2833) 34: Modem Mode, ANSam tone Detected (RFC2833) Analysis • is the originating Cisco ATA, and is the terminating gateway. • Both sides initially use G.729. • gateway sends NTE signaling packets, then upspeeds to G.711µ-law. • The Cisco ATA switches to G.711µ-law also, but never sends NTE signaling packets. • Fax transmission fails because gateway does not receive any NTE packets, and it drops the fax call. Possible Cause for Failure • The Cisco ATA does not support the NTE signaling method and requires that the gateways use the NSE signaling method. rtpcatch Limitations • rtpcatch performs optimally when analyzing capture files containing only one VoIP session. • rtpcatch detects only G.711A, G.711µ-law, G.723, G.729, T.38, Cisco fax relay, modem pass-through with or without redundancy packets, RTCP packets and NSE packets. OL-3410-01 Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide (SIP) 7-19