[原文]Pingtel Xpressa 1.2.5 through 2.0.1 uses predictable (1) Call-ID, (2) CSeq, and (3) "To" and "From" SIP URL values in a Session Identification Protocol (SIP) request, which allows remote attackers to avoid registering with the SIP registrar.

[CNNVD]Pingtel Xpressa Phone Weak会议参数漏洞(CNNVD-200212-805)

        从Pingtel Xpressa 1.2.5 到2.0.1版本使用会话标识协议（SIP）请求的预测(1) Call-ID， (2) CSeq，和 (3) "To" 和 "From" SIP URL值。远程攻击者避免SIP注册登记。