ok so this is what i can see. this is an outgoing call: Telepresence EX90 -> CUCM -> Expressway-C ->Expressway-E -> external SIP Plattform   the invites are without SDP, on Expressway-E i see: incoming 200 OK with SDP:  v=0  o=Acano 0 0 IN IP4 192.168.x.x  s=-  c=IN IP4 193.x.x.x  b=AS:4000  t=0 0  m=audio 37426 RTP/AVP 108 107 96 109 110 9 99 111 100 104 103 0 8 15 102 18 13 118 101  b=TIAS:256000  %a lot of codecs%  m=video 37428 RTP/AVP 97 116 114 96 34 31 100 121  b=TIAS:3744000  %a lot of codecs%  m=video 37430 RTP/AVP 97 116 114 96 34 100 121  b=TIAS:4000000   a=content:slides  a=sendrecv %a lot of codecs%  m=application 37434 UDP/UDT/IX *    then i see a 200 OK Send to Expressway-C with:  v=0  o=CiscoSystemsCCM-SIP 1560368 1 IN IP4 192.x.x.x  s=SIP Call  c=IN IP4 192.x.x.x  b=AS:384  t=0 0   i found out that someone put a Bandwidth PIPE Config with this limit :( works now, could not imagine that it is simple as that, because calls to skype for business work with 2000 kpbs, nice to know that these calls completely ignore bandwith settings ;-) ... View more

so here is the solution that we found out, basically it is how Christian Nuche wrote, but with a small but importent note: your Remote Destination Profile is bound to a user. to make this Remote Destination Profile ring for hunt Group calls, all Phones, which have the Owner Userid set to the user which is configured in the Remote Destination Profile, MUST be "Logged into Hunt Group". And this applies also if these phones have a completely different phone number. on the other side lets say for example 2 phones and the remote Destination Profile have  a shared line, but the owner userid of the phones is different then the userid on the Remote Destination Profile: then it does NOT matter if the phones are "Logged into Hunt Group". Makes no big sence to me, because i thought the owner userid is only for licensing, but this is how it is. ... View more