Have a CUBE on 3800 with 15.14M(6) with SIP to SIP dial peers. Some external inbound callers at times can hear no audio streaming from IVR.
I run a traffic capture from the LAN side of the CUBE and I can hear the audio.
I run a traffic capture on the WAN side (towards caller) and i hear nothing, BUT the rtp stream is active (50 pps G711a). When i replay this stream on Wireshark i hear silence exactly what the caller can hear...
G711a on both sides but no audio is heard on the WAN side exiting the CUBE towards telco
DIal peers matched= 31 In from itsp and 40 Out to CUCM
ITSP--SIP Trunk-- MyCUBE--SIP Trunk--CUCM--IVR(CTI Ports and RPs)
7900 Type A sccp Handsets