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gmail plugin allows calls to phones for free

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geno said:
You could always run a sniffer during a call to see what protocol they're using. I'd put my money on SIP or H.323
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good idea, i tried wireshark, filtered for viop, saw nothing during a call.
go figure
i'm probably using it wrong..sigh
 
i heard on the radio that google is allowing free calls from Australia to the USA

  1. Is this true?
  2. Who is gonna give me their number so i can call them?
 
silverpig said:
Gmail Voice launches

I just installed it and got it to work here! You get a prompt in gmail to install a plugin, install, reboot, and then you can pop up this little dialer. You enter any phone number and it makes the call and you can talk through your browser to any phone. If the phone you're calling is in Canada or the US, the call is free!
Click to expand...

so you're saying I need some sort of mic? :hmm:
 
0roo0roo said:
good idea, i tried wireshark, filtered for viop, saw nothing during a call.
go figure
i'm probably using it wrong..sigh
Click to expand...

Hm, I know personally that Wireshark will pull SIP/H.323 by using "voip calls", but can't comment on other protocols. So either you're doing it wrong or Google's using something that's eluding Wireshark's "Voip calls" function. I'd sift through an unfiltered trace and see what you can find if you really are gung-ho on prioritizing your calls in QoS.

OK talking about it has me curious - I'm going to give it a go myself. I'll let you know what I come up with 😛
 
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I see nothing resembling H.323 or SIP flowing through my local interface :hmm: but the media (audio) is coming through on port 19295 for me. Try that and see where it gets you. You might also want to prioritize the STUN packets which are interspersed throughout the call. I'm guessing it's somewhat of a keepalive verifying the IP is still connected. I think I was giving Gmail Voice too much credit thinking it was a full-fledged endpoint, but I think any industry-standard protocols are being used on Google's end while they use something more proprietary to transmit / receive media and signaling from their customers. But this is exactly why Wireshark doesn't see anything relating to VoiP when you try filtering...
 
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