Hi, Just wondering if anyone every used SIPp with a SER server that has authentication enabled? I am trying to do so but SER doesn't seem to acknowledge the authentication details entered in my REGISTER message in my xml file (which is in turn accessing them from a csv file). Would someone mind attaching their xml file if they achieved this? 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.