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The other aspect would be emergency calls and location for Skype to be considered commercial and full fledged voice service. An operator might be willing to ensure QoS for OTT voice provided it makes business sense for them i.e, some revenue sharing with Skype.


I always thought that for an operator point of view it wasn't interesting to offer VoIP for a question of (radio) network efficiency. Instead, Skype offer to use circuit switch between an application on the terminal and a Skype server before going back to a "standard" Skype VoIP call.



Thanks for commenting! I think Skype over CS is a temporary solution an specific to one operator. I'd be surprised if many would follow. Mobile operators don't like VoIP today but with LTE at the latest, it's difficult to avoid it.

And there are lots of features to make it less of a waste of bandwidth such as IP header compression, better codecs and VoIP air interface scheduling.


Dimitris Mavrakis

Hi Martin,
interesting post, especially VoIP air interface scheduling.

I will be amazed if operators actually use DPI to prioritise VoIP. Quite a departure from what's happening today.

From your experience (and instinct), what percentage of covered areas with HSPA can successfully deliver VoIP for mobile users?

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