[Freeswitch-users] Virtualized FreeSWITCH

Chris Fowler chris at fowler.cc
Wed Mar 3 09:17:02 PST 2010

Hi Rob,

We run FreeSWITCH on AWS' EC2.  A medium EC2 instance is happily supporting 100 Polycom users, conference bridges etc.  Been running for over a year.  We also use FlowRoute as our PSTN->SIP Interface, and also Skype Business SIP.  Our users are scattered across the globe - so having the box sitting on AWS' network infrastructure is key to avoiding issues with latency, jitter, packet loss (i.e. I don't think we could afford the connectivity AWS gives us if we had to provision this in-house).

There were no special tricks; you do need to modify/override the following with the box's Elastic IP (EIP).

modify conf/vars.xml and update
  <X-PRE-PROCESS cmd="set" data="domain=<YOUR DOMAIN HERE>"/>

  <X-PRE-PROCESS cmd="set" data="default_provider=sip.flowroute.com"/>
  <X-PRE-PROCESS cmd="set" data="default_provider_username=<USER>"/>
  <X-PRE-PROCESS cmd="set" data="default_provider_password=<PASS>"/>
  <X-PRE-PROCESS cmd="set" data="default_provider_from_domain=flowroute.com"/>
  <X-PRE-PROCESS cmd="set" data="default_provider_register=true"/>

  <X-PRE-PROCESS cmd="set" data="bind_server_ip=<AWS EIP>"/>
  <X-PRE-PROCESS cmd="set" data="external_rtp_ip=<AWS EIP>"/>
  <X-PRE-PROCESS cmd="set" data="external_sip_ip=<AWS EIP>"/>

  <X-PRE-PROCESS cmd="set" data="outbound_caller_name=<YOUR NAME>"/>
  <X-PRE-PROCESS cmd="set" data="outbound_caller_id=<YOUR CID>"/>

 <param name="aggressive-nat-detection" value="true"/>
 <param name="multiple-registrations" value="true"/>
 <param name="ext-rtp-ip" value="$${external_rtp_ip}"/>
 <param name="ext-sip-ip" value="$${external_sip_ip}"/>
 <param name="NDLB-received-in-nat-reg-contact" value="true"/>
 <param name="NDLB-force-rport" value="true"/>
 <param name="NDLB-broken-auth-hash" value="true"/>
 <param name="enable-timer" value="false"/>

 <param name="aggressive-nat-detection" value="true"/>
 <param name="ext-rtp-ip" value="$${external_rtp_ip}"/>
 <param name="ext-sip-ip" value="$${external_sip_ip}"/>
 <param name="NDLB-force-rport" value="true"/>

    <param name="rtp-start-port" value="16384"/>
    <param name="rtp-end-port" value="32768"/>

Cheers, Chris.
RightScale, Inc.

-----Original Message-----
From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Rob Forman
Sent: Tuesday, March 02, 2010 9:05 PM
To: freeswitch-users at lists.freeswitch.org
Subject: [Freeswitch-users] Virtualized FreeSWITCH

Hi all,

Is anyone running FreeSWITCH virtualized (xen or vmware) in
production?  I saw ec2 and xen mentioned a few places.  If so, are
there tips or tricks for handle timer issues which affect virtual
machines in general, such as recommended divider or clocksource
settings?  I'm seeing funny timing issues while testing with audio
recording and playback that speed up or slow down.

I have tried both paravirt and hvm.  The default xen kernel has a
timer of 250, so I tried to hvm instead using the stock 5.3 kernel
with the 1khz timer but didn't see much improvement.

All of this was tested on 64-bit CentOS 5.3.
- Physical host: Linux localhost.localdomain 2.6.18-164.11.1.el5xen #1
SMP Wed Jan 20 08:06:04 EST 2010 x86_64 x86_64 x86_64 GNU/Linux
- Paravirt host: Linux localhost.localdomain 2.6.18-128.el5xen #1 SMP
Wed Jan 21 11:12:42 EST 2009 x86_64 x86_64 x86_64 GNU/Linux
- Hvm host: Linux localhost.localdomain 2.6.18-128.el5 #1 SMP Wed Jan
21 10:41:14 EST 2009 x86_64 x86_64 x86_64 GNU/Linux

I'm sure physical hosts are the de-facto best practice, but are
virtual machines not worth it at all?


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