[sr-dev] about rtpengine trust-address flag and "received from" key

i would like to return to rtpengine trust-address flag. README says: trust-address - flags that IP address in SDP should be trusted. Without this flag, the RTP proxy ignores address in the SDP and uses source address of the SIP message as media address which is passed to the RTP proxy. the first part makes sense, i.e., if the flag is present, then ip address in the sdp is trusted. the second part does not make sense to me and neither does "received from" key of request passed to rtpengine. rtpengine doc tells about "received from": Contains a list of exactly two elements. The first element denotes the address family and the second element is the SIP message's source address itself. The address family can be one of IP4 or IP6. Used if neither the trust address flag nor the media address key is present. there is at least two reasons why it does not make sense to pass source ip address of sip request to rtpengine: 1) the proxy that is calling rtpengine_offer() may not be the first hop proxy of the sip ua. 2) even when sip proxy is the first hop, sip ua may not use the same ip address for sip signaling and rtp media so what is the reason for the existence of "received from" key? is there anything lost if the key is removed? if not, then lets get rid of it in order to simplify things and to avoid confusion. -- juha