I see that two rival vendors of 3G fixed routers (typically used in corporate networks) have announced HSUPA versions of their products, with commentary about their suitability for VoIP.
Top Global - "Many of our enterprise customers are using the 3G MobileBridge (MB8000) with which route voice traffic from their remote offices over 3G cellular network work to their corporate IP-PBX"
Sarian (release isn't up on the site yet, but their PR team has sent it to me) which major on the use of the technology for uploading real-time, legal evidence-quality CCTV but also refers to the possible use of the 3G router for emergency backup of fixed-line VoIP "ability to route large quantities of data in real-time also facilitates business tools such as VoIP and video-conferencing, while in the event of fixed-line network crisis"
Obviously, this is something of a niche usage case, compared with handset- or laptop-based VoIPo3G, but it's still interesting to see, especially as it will be a further driver for carriers to relax restrictions on VoIP on their 3G data plans, particularly for their corporate customers.
It's also another thing that packet inspection / policy boxes (and their managers) need to be aware of - having the network squash someone's disaster-recovery traffic is unlikely to drive customer loyalty.....
The question is whether the rest of the QoS & policy infrastructure (and the people managing it) will have the fine-grained control to say that certain customers' VoIP is acceptable, and others might not be. Especially as the VoIP may be added as a use case for the backup system by the enterprise network manager at a later date - you'd hope they would check the T's & C's they'd signed previously, but in reality?
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