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Has anyone figured out what the correct ports are for QoS settings for Google Chat voice converstations? I need to boost the priority of these packets on my home network, but I can't find any docs on what to set.

I'm hoping that someone out their has either found it or figured it.

Thanks

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3 Answers 3

From How do I allow my internal XMPP client or server to connect to the Talk service?:

To allow full voice and video interoperability with the Google Talk service, you must:

  • Allow your XMPP clients to connect to all IP addresses contained in the IP blocks listed in Google's ASN of 15169, on:

    • UDP ports 4893, 19295, and 19302
      or
    • TCP port 19294

The voice traffic goes over port 19295. So i created a high priority rule for:

  • Protocol: UDP
  • Direction: out
  • Destination Port: 19295

  • Protocol: UDP

  • Direction: in
  • Source Port: 19295

Or just use Process Monitor, filter it by

  • Process Name: googlevoicechat.exe
  • Activity: Network

and watch the screenfuls of UDP voice traffic:

enter image description here

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June 16, 2013: This seems to have changed since 2011. I couldn't find any current documentation.

Did some work with a packet sniffer today (Wireshark) dialing out from the Google Talk Plugin under Firefox 21.0 running on Windows 7.

Looks like the call setup is now done through standard HTTPS (TCP 443).

In several test calls, RTP (voice) packets were sent to UDP destination port 19305. I have no idea whether that will stay the same.

The Differentiated Services Field (DSCP) of the RTP packets is 0, so that can't be used for OoS setup.

On my router running Tomato, in the OoS settings, I have classified application Layer 7 (RTP) as Highest. Unfortunately it is not detecting the Google Voice packets; they were passing as Low priority. So I added a new entry for UDP Destination 19305 and the RTP traffic was properly prioritized.

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As of today, there are two scenarios:

  1. Google Hangouts and calling a regular phone number from within gmail: UDP ports 19305 to 19309 (https://support.google.com/a/answer/1279090?hl=en)
  2. For a computer to computer voice call (started with the phone icon in gmail, not a hangout without video), the connection is from your ip address to the ip address of the computer of the person you're talking with and the ports (source and destination) appear to be chosen randomly (I will update this answer if observations suggest that there is a range)
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