Cisco ATA188-I2-A Administration Guide - Page 172
rtpcatch Limitations, detects only G.711A, G.711μ-law, G.723, T.38, Cisco fax relay, modem
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Debugging the Cisco ATA 186/188 Fax Services Chapter 7 Configuring and Debugging Fax Services • 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. • rtpcatch can handle a maximum of 20 prserv ports using the -port option. • rtpcatch may not detect T.38 packets correctly. 7-20 Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator's Guide for H.323 (version 3.0) OL-4804-01