Thread: Dr. Ari Jaaksi on Maemo 5
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allnameswereout is offline allnameswereout
2008-09-20 , 14:26
Posts: 3,397 | Thanked: 1,212 times | Joined on Jul 2008 @ Netherlands
#274
Originally Posted by Jerome View Post
I think that the people who think that voip over cellular data is an option forget something important
Yes, you made some good points with your compares of SS7 & SIP over HS*PA however despite that the codecs wouldn't saturate the connection. Most data plans provide far more than 64 kbit/sec upload.

Now lets say 64 kbit up, and 64 kbit down, that is approx 1 MB per minute. If you have a data plan of 1 GB/month for 30 EUR, you pay 0,03 EUR for 1 MB. For international data calls you can't beat that.

ip and the data connection use an additional encapsulating layer on the air interface (it matters more if you lose one packet of data than one packet of voice).
That also depends on whether you use TCP or UDP.

This is the main drive behind the telcos blocking sip. They would rather give you unlimited voice calls than have you run g.711 on their network (and it happens often that sip adapters don't agree on anything else).
I'm not sure they're blocking SIP.

But they're not providing unlimited voice calls either. And you know why they don't do that. There is no incentive.

In a healthy environment, telcos would compete with each other but we don't see this in the GSM/3G market very much.

In Germany, all cellular carriers have changed their contracts about two years ago to specify that voip is not allowed. It took them two years to have the limitation active, because that is the usual maximum contract length. And that will hold in court: if you sign as a user that you are not allowed to run voip, there is no way you can complain.
Yes, there is. Nobody knows if the contract holds up in court. It is gonna be a lot tougher though.

And minors I recommend to sign any contract they're getting. Because these aren't legally binding because they're under age!

One thing is sure: for international data calls, SIP is worth it.
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