Global SIP Deployment

500 sites tested
0 DNS errors
25 with SIP


500 sites tested
1 DNS error
10 with SIP


500 sites tested
0 DNS errors
24 with SIP


500 sites tested
0 DNS errors
22 with SIP


500 sites tested
0 DNS errors
14 with SIP


3083 sites tested
236 DNS errors
328 with SIP

South Korea

500 sites tested
0 DNS errors
19 with SIP

United Kingdom

500 sites tested
0 DNS errors
14 with SIP

United States

500 sites tested
0 DNS errors
43 with SIP

What do these numbers mean?

This experiment attempts to answer the following question: If an average user had a working installation of SIP on their machine, how useful would it be to them? What percentage of the services and sites the average user regularly accesses are SIP-enabled? In other words, the experiment attempts to quantify the usefulness of SIP to the average end user, given the current deployment of SIP in the Internet.

The experiment does not track how many users or hosts use SIP in the current Internet. It also does not track how many sites have configurations of SIP that are not accessible by average users from the Internet.

The Session Initiation Protocol (SIP) is an application-layer control (signaling) protocol for creating, modifying, and terminating sessions with one or more participants. It can be used to create two-party, multiparty, or multicast sessions that include Internet telephone calls, multimedia distribution, and multimedia conferences.

The IETF statistics are based on a list of domain names that are derived from the email addresses of currently-active document authors of Internet Engineering Task Force (IETF) documents. This data set was included to investigate if the organizations that IETF authors come from are more progressive in deploying SIP, compared to the rest of the Internet.

How are these numbers generated?

The scripts that update this page retrieve the names of the web sites that are most popular across the globe, as well as in select countries, from in regular intervals. They then check whether the DNS entry for each site name reflects that it uses SIP. The numbers above show the percentage of these top sites that are SIP-enabled, as well as the absolute numbers.

Note that although the DNS entry for a site may indicate that SIP is available, this does not necessarily mean that actually using SIP with the site will succeed. I’ll eventually add code to verify that SIP can be used with sites that claim to enable it.

How representative are these numbers?

They’re reasonably representative, but not perfect. One issue is that the sample sets are very small; typically offers lists of 100 to 500 top sites for free, depending on the country. More importantly, though, the sample sets are derived from web site names, because that’s all offers. It is not clear that checking SIP deployment based on a set of web site names is resulting in numbers that represent deployment of SIP in the broader Internet.

Attention, operators: I’m interested in basing these statistics on a more meaningful data set. If you can provide me with a regularly-updated list of most-frequently-looked-up DNS names – or, for SPF or DKIM, a list of the domains that generate the most inbound email – please contact me at please enable javascript to view . The larger your network and the longer the list, the better.

How have these numbers been changing over time?

Funny you should ask. The graphs below (click on each image to get a PDF that lets you zoom in) illustrate the weekly changes of SIP deployment in the various sample sets since these measurements started in October 2007:

SIP deployment trends - click to zoom in (PDF)

This graph shows the same data as the one above, but zooms in on the interesting area:

SIP deployment trends (magnified) - click to zoom in (PDF)

Significant jumps in the historic data (e.g., fall 2008 or spring 2009) are usually due to changing what data they make available, or on tracking bugs having been fixed. The latter fixes are often based on suggestions of visitors to this page. See the acknowledgements below.

Download deployment trends as text: global cn de fi in jp kr uk us ietf

Acknowledgements and Changes