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DTMF interworking from RTP NTE to SIP KPML or any OOB method fails without any OOB digit sent. Inbound RTP NTE digits are received correctly but Router doesn't punt the UDP packet to be processed and send the Digit Out of band. The following error is seen in the debugs: voip_rtp_recv_fs_input: RTP punted to validate checksum VOIPFPI:():voip_fpi_process_punt_msg: ip_fs_input failed
- IOS-XE: 17.3.4a or higher, including 17.7.1a and 17.6.2 - DTMF interworking between RTP NTE and SIP KPML or any SIP Out of Band method
"no ip udp checksum" in the dial-peer where the rtp-nte DTMF packets are received will workaround the issue
The debug output required to observed the behavior are: debug ccsip messages debug ccsip feature dtmf debug voip fpi all debug voip rtp all
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