| sip 揭密英文版，学习sip协议很好的教程，可以与中文版一块阅读。- 下载 |
| 超星格式的有关SIP的书，SIP揭密，讲的很详细，拿出来给大家共享一下下-Superstar format of the SIP, SIP to conduct, said very detailed, out to share about the next 下载 |
| 这个电子书是SIP揭密,是一本很基础的书,很适合初学者学习-the e-books is to conduct SIP is a very basic, the book is suitable for beginners learning 下载 |