Tuesday, February 17, 2009

Top three free VoIP services

Like with emails, some of us prefer to have an independent SIP address, with no relation to current job or location. Being asked several times about free services running Kamailio (OpenSER) or SIP Express Router (SER) – the recently SIP Router project, I am doing a top of my favourite free VoIP providers.

No preference among them, you have to figure out what fits the best for you alone, so I am just listing them in alphabetic order.


Managed by the author of Ekiga SIP Softphone. Some of the features:

  • peering interconnection
  • presence
  • audio conference
  • address book

More at:



Managed by several developers of SIP Express Router (SER). Some of the features:

  • speed dial
  • pstn gateway self provisioning
  • call forward
  • accounting view

More at:



Managed by the founders of VoIPUser.org web forum.

  • UK inbound PSTN number
  • limited outbound calls
  • INum numbers and interconnection
  • peering

More at:


Wednesday, February 11, 2009

SIREMIS v0.9.1 Released

A new version, 0.9.1, of SIREMIS - the web management interface for Kamailio (OpenSER) and SIP-Router.org - is released.

New features and improvements:

  • send MI commands to Kamailio (OpenSER) via UDP
  • display the output of a MI command
  • ability to predefine MI commands that can be selected from a drop-down menu
  • create graphic charts from statistic data
  • one or more charts per page
  • one or more graphics per chart
  • no new coding required, only configuration changes required to add new charts
  • drop-down selection for user AVP type

Goals for next version:

  • carrierroute management
  • rating engine for CDRs

View screenshots of the 0.9.1:


Relevant screenshots for new features:

Demo site (it works on a database with random data, no MI; username: admin, password: admin):




Install/Upgrade documentation:


Monday, February 9, 2009

FOSDEM2009 - Photos

First 2009 Kamailio(OpenSER) and SIP-Router.org meeting happened in Brussels, Belgium, Feb 7, during FOSDEM 2009. Some photos are available at:


We had couple of interesting discussions:

- scalability - combined with MySQL track, everyone was interested in how to increase the performance and integrated better what latest MySQL offers in terms of HA and replication, good input from Henning Westerholt based on experiences with 1&1’s 2 000 000 users platform

- programmable presence server - with idea and large interest of SipWise and Andres Granig

- media services - nice talks with Olle E. Johansson and Stefan Sayer

- light b2bua - pushed on the table by Alexander Dubovikov

Probably next meeting will be the SIP-Router.org integration meeting.