Hello, This question isn't directly related to SER so I apologise, however I am finding it difficult to find a windows softphone that is fully RTCP compliant (according to RFC 1889, 3550). I use a SER platform. I was using XLite and discovered that they have implemented the RTCP stack incorrectly. I subsequently tried a copy of Eyebeam and unfortunately there are errors in that implementation also. SJPhone doesn't seem to send RTCP values and with Windows Messenger some of the RTCP fields are consistently set to 0 which is most definitely incorrect. If anyone can advise on this I would be very grateful. Many thanks, Aisling. -------------------Legal Disclaimer--------------------------------------- The above electronic mail transmission is confidential and intended only for the person to whom it is addressed. Its contents may be protected by legal and/or professional privilege. Should it be received by you in error please contact the sender at the above quoted email address. Any unauthorised form of reproduction of this message is strictly prohibited. The Institute does not guarantee the security of any information electronically transmitted and is not liable if the information contained in this communication is not a proper and complete record of the message as transmitted by the sender nor for any delay in its receipt.