一、osip2和eXosip2
作爲SIP
客戶端的開發協議棧
osip2:
文檔地址:https://www.gnu.org/software/osip/
源碼地址:http://ftp.gnu.org/gnu/osip/
eXosip2:
文檔地址: http://www.antisip.com/documentation/exosip2/modules.html
源碼地址:http://download.savannah.gnu.org/releases/exosip/
二、PJSIP
作爲SIP
服務端開發庫
https://www.pjsip.org/download.htm