2017-11-28 16:25:18 作者： james.zhu 来源：Asterisk微信公众号 评论：0点击： 前面的讲座中我们谈到了SDP和SDP的修改的问题。在当前的企业通信中，我们会经常遇到一个功能叫语音等待功能，这个功能就涉及了SDP的修改问题。 因此，在本章节我们会介绍一下音乐等待中 ...

In Part 1 of our SIP primer, I covered the SIP foundation layers starting from the message structure and ending with the SIP transactions. We saw how phone registrations and proxies could work using ...

SIP session requests leverage the “session description protocol (SDP)” to define session characteristics such as media type, codec, and so on. While the IETF and SIPforum have standardized many of the ...

The 18th Internet Telephony Conference & Expo (ITEXPO) came to Los Angeles last week, and being the opportunistic sort, I decided to get myself on the press list. That's one of the advantages of ...

Session initiation protocol (SIP)-based voice-over-IP (VoIP) designs certainly provide some interesting benefits over today's Class 5 switching systems. SIP enables capabilities like presence, instant ...

Broadcasting over IP is rapidly becoming the paradigm by which broadcasters are planning future broadcast network infrastructures. Within the diverse range of broadcast IP devices coming onto the ...

Update: We're in the last throes of winter break 2019, which means most Ars' home office phones can stay dormant for a few more days. As such, we've been resurfacing a few classics from the ...

A bug in a Realtek software development kit (SDK) means any third party devices with software that uses the SDK could inherit a vulnerability in their Session Initiation Protocol (SIP) implementations ...

Codec manufacturer APT announced that its IP codecs — the Horizon, Meridian, Eclipse and Oslo lines —support SIP/SDP protocols. This will allow APT’s IP codecs to communicate with codecs made by other ...

As part of VoIP threats series, I’d like to introduce Malformed Messages (or Protocol Fuzzing). An attacker may create and send malformed messages to the target server or client for the purpose of ...