Google Talk and Open Communications
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Last updated 1/17/06
Google's mission is to make the world's information universally
accessible and useful. Google Talk, which enables users to instantly
communicate with friends, family, and colleagues via voice calls and
instant messaging, reflects our belief that communications should be
accessible and useful as well. We're committed to open communications
standards, and want to offer Google Talk users and users of other
service providers alike the flexibility to choose which clients,
service providers, and platforms they use for their communication
needs.
Client Choice | Service Choice | Platform Choice
Client Choice
-------------
1. What is "client choice" and how is Google Talk enabling it?
2. Which other clients can connect to the Google Talk service?
3. I am a developer of an IM client. How do I connect to the Google
Talk service?
4. Do you plan to support other real time communication protocols?
5. What protocols are used for voice calls?
6. Which voice codecs do you support?
1. What is "client choice" and how is Google Talk enabling it?
In addition to the Google Talk client, there are many other clients
out there that provide a great communications experience. We believe
users should have choice in which clients they use to connect to the
Google Talk service and we want to encourage the developer community
to create new and innovative applications that leverage our service.
To enable this, Google Talk uses the standard XMPP protocol for
authentication, presence, and messaging.
2. Which other clients can connect to the Google Talk service?
Any client that supports Jabber/XMPP can connect to the Google Talk
service. Here's a list of popular clients.
3. I am a developer of an IM client. How do I connect to the Google
Talk service?
As long as you adhere to the requirements of the XMPP specs, you
should be able to connect to the Google Talk service.
You need to know the following:
* The service is hosted at talk.google.com on port 5222
* TLS is required
* The only supported authentication mechanism is SASL PLAIN
4. Do you plan to support other real-time communication protocols?
Google Talk supports XMPP with the beta release. We plan to support
SIP in a future release. Additionally, we will evaluate other
protocols as appropriate, to continue to deliver on our commitment to
open communications.
5. What protocols are used for voice calls?
Google Talk uses extensions to XMPP for voice signaling and
peer-to-peer communication. Source code and documentation for these
extensions is now available.
In addition, these extensions are in the process of being reviewed by
the XMPP standards body as official enhancements (known as XEPs) to
the standard. Note that the source code for Google Talk's current
implementation of these extensions varies slightly from the proposed
specs. Upon ratification of the specs, Google Talk (and the source
code) will be updated to be in full compliance.
In the future, we plan to support SIP signaling as well.
6. Which voice codecs do you support?
Today, Google Talk supports the following standard voice codecs: PCMA,
PCMU, G.723, iLBC, and Speex. We also support codecs from Global IP
Sound: ISAC, IPCMWB, EG711U, EG711A.
Service Choice
--------------
1. What is "service choice" and how does Google Talk enable it?
2. Whom are you federating with?
3. Do service providers need explicit approval to federate with the
Google Talk service?
4. Do you plan to support other industry standards for
communications interoperability?
5. Where can I get more technical information about federating with
the Google Talk service?
1. What is "service choice" and how does Google Talk enable it?
Service choice is something you have with email and, for the most
part, with your regular phone service today. This means that
regardless of whom you choose as your email service provider (Gmail,
Hotmail, Yahoo! Mail, your school or ISP, etc), you can email anyone
who is using another service provider. The same applies to phone
service. You can call someone even if they do not use the same phone
company as you do. This allows you to choose your service provider
based on other more important factors, such as features, quality of
service, and price, while still being able to talk to anyone you want.
Unfortunately, the same is not true with many popular IM and VOIP
networks today. If the people you want to talk to are all on different
IM/VOIP services, you need to sign up for an account on each service
and connect to each service to talk to them.
The Google Talk network supports open interoperability with hundreds
of other communications service providers through a process known as
federation. This means that a user on one service can communicate with
users on another service without needing to sign up for, or sign in
with, each service.
2. Whom are you federating with?
We currently support open federation with any service provider that
supports the industry standard XMPP protocol. This includes Earthlink,
Gizmo Project, Tiscali, Netease, Chikka, MediaRing, and thousands of
other ISPs, universities, corporations and individual users.
3. Do service providers need explicit approval to federate with the
Google Talk service?
No, there is no paperwork involved. Service providers just need to
support the XMPP standard for server-to-server federation and their
users will be able to talk to our users (and vice versa).
4. Do you plan to support other industry standards for communications
interoperability?
Yes, we plan to support SIP.
5. Where can I get more technical information about federating with
the Google Talk service?
If you are building your own XMPP service, refer to the XMPP specs. If
you are using a commercial or open-source jabber server such as
ejabberd, then federation should just work. One important thing to
note is that we use dial-back for authentication.
If you have any other questions, feel free to post to the Google Talk
Interoperability Google Group.
Platform Choice
---------------
1. What is "platform choice" and how does Google Talk enable it?
2. What platforms does Google Talk support?
3. Do you plan to support the Google Talk client on other platforms?
1. What is “platform choice” and how does Google Talk enable it?
Platform choice means that you can connect to our service using the
operating system and device of your choice. Google Talk enables
platform choice by letting users of other operating systems connect to
the Google Talk service using other IM clients.
2. What platforms does Google Talk support?
While the Google Talk client is only available on Windows today, you
can connect to the Google Talk service using one of many third-party
clients.
3. Do you plan to support the Google Talk client on other platforms?
We look forward to the Google Talk client supporting Linux and Mac OSX
in the future.
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