Category Archives: VoIP

Why the kernel hrtimer might not be a high-resolution timer

I commented in this post that just because DAHDI thinks it has a High Resolution timer from the kernel, this might not actually be the case. When you compile the DAHDI dummy driver it checks your kernel headers to see if you compiled your kernel with CONFIG_HIGH_RES_TIMERS, in which case the specific functions in the [...]
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DAHDI (formerly Zaptel) Dummy and VMware ESXi

First, some background: We run a number of production VoIP PBXs, a number of which are Asterisk-based. Historically one of the tricky things about pure-VoIP Asterisk deployments (those which talk pure SIP and IAX2) is that you still need a timing source if you want to do any conferencing, audio-playback or IAX2 trunking. Asterisk doesn’t [...]
Also posted in Virtualisation | Tagged , , , , , , | 3 Comments