[SR-Users] SIP Server Hardware or VM ??

Daniel Tryba d.tryba at pocos.nl
Wed May 23 16:02:32 CEST 2018

On Wed, May 23, 2018 at 01:25:58PM +0000, Pinter, Gerd. wrote:
> The question is, if anyone has experience if this issue maybe can be
> solved by running the Sip Server on a standalone hardware plugged into
> network Port on our Hardware Firewall, instead of a virtual Machine
> running on VM with virtual switches and so on. The current SIP Server
> has a Public IP Address, but all the Traffic runs thru Firewall, VPN,
> Hardware Switches and Virtual Switches. What you think?

Virtualisation can/will add some jitter, but if you configure your setup
correctly it will work fine for normal phone calls [*]. For example in
VMware there is something caller NIC interrupt coalescing. AFAIK this is
enable by default but introduces latency for RTP streams.

But have bare hardware with a rtpproxy will perform better, without any
tuning a recent machine relayed 900Mbit/s (simulated RTP packets) with
ease, running vmware a single cpu guest instance was limited to about
40Mbit/s, 2 CPUs in the guest topped out at  about 90Mbit/s before
jitter and eventual loss occured (with coalescing disabled).

*: jitter introduced by rtpengine is negligible compared to the jitter
introduced by the endpoints themselves (either devices or network

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