Hello, Can FreeSWITCH be configured not to include P-Early-Media tag in it's 180 ringing? Is any of the boxes involved breaking the specs? Call scenario is that far-end SBC sends INVITE to FS with /P-Early-Media: supported/ tag. Freeswitch routes call and replies with 180 Ringing with /P-Early-Media: sendonly/ tag to the far-end SBC. Far-end does not generate ringback when it sees P-Early-Media: sendonly. Freswitch does not provide in-band ring-back either (cause it's just 180 Ringing without SDP). Last but not least, FreeSWITCH runs in bypass media mode. Thank you, Victor