thanks you , but i am using h323plus 1.26.0 now. and i find the way to send data by default is UDP, how to set it to TCP and There is no detailed instructions for use. ------------------ 原始邮件 ------------------ 发件人: "Robert Jongbloed";<robertj@voxlucida.com.au>; 发送时间: 2016年5月26日(星期四) 晚上6:31 收件人: "h323implementers"<h323implementers-bounces@lists.packetizer.com>; "h323implementers"<h323implementers@lists.packetizer.com>; 主题: Re: [h323implementers] hi If you really are using openh323, it has not been active for many years now. You should use either H323Plus or OPAL voip depending on your needs. ----------Robert Jongbloed Vox Lucida Pty. Ltd. -----Original message----- From: 陈炳锡-阳阳谷信息科技 Sent: Thursday, 26th May 2016, 19:40 To: h323implementers Subject: [h323implementers] hi hi is it a bug of OpenH323? i have a problem in using openh323, in the OpenH323 transmission channel, i am send more than 65K of the size of the data, it will not be sent out.