与Google Talk Service对接常见问题

I am a developer of an IM client. How do I connect to the Google Talk service?

As longas you adhere to the requirements of the XMPP specs, you will be able toconnect to the Google Talk service.

You needto know the following:

l The service is hosted attalk.google.com on port 5222

l TLS is required

l The only supported authenticationmechanism is SASL PLAIN

What protocols are used for voice calls?

GoogleTalk uses extensions to XMPP for voice/video signaling and peer-to-peercommunication. Currently, Google Talk’s implementation differs slightly fromthe draft XMPP Jingle specifications. However, Google Talk is in the process ofbeing updated to be in
full compliance with the Jingle specifications.

Detailson the voice and video signaling used by Google Talk are available in theGoogle Talk Call Signaling document. Additionally, the open source libjinglelibrary is provided to make it easy to implement voice/video interoperabilitywith Google Talk.

Which voice codecs do you support?

Today,Google Talk supports the following standard voice codecs:

PCMA

PCMU

G.722

GSM

iLBC

Speex

We alsosupport the following codecs from Global IP Sound: ISAC, IPCMWB, EG711U,EG711A.

Which video codecs do you support?

GoogleTalk supports the following video codecs:

H.264/SVC

H.264

H.263-1998

Supportfor the Google VP8 codec is in process.

Is google talk fullly compliance with XEP-0166:Jingle and XEP-0167:
Jingle RTP Sessions?
Google supports both the jingle protocol described in XEP-0166 and -0167, and a previous version of jingle.