The RTP payload mappings used by CUBE are known to cause issues with the solution. The web-gateway uses 126 for RFC 2833 telephone-event whilst CUBE maps that to fax passthrough as shown here. The recommended solution config for CUBE from Cisco is as follows:
In the voice service voip sip section:
asymmetric payload full midcall-signaling passthru
And in the dial-peers:
video codec h264 rtp payload-type cisco-codec-fax-ack 107 rtp payload-type nte 126 rtp payload-type cisco-codec-video-h264 97 codec g711ulaw
#Specify the payload 13 statically to avoid PayloadNumberException
rtp payload-type comfort-noise 13
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