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> Mobile carriers do not use VoIP with the MS No, they do, exclusively. LTE and beyond don’t even support circuit switched calls anymore. Bellhead wasn’t inte
by lxgr 2y ago
> Mobile carriers do not use VoIP with the MS
No, they do, exclusively. LTE and beyond don’t even support circuit switched calls anymore.
Bellhead wasn’t intended in a derogatory way, just as a reference to the “Netheads vs. Bellheads” schools of thinking about networks.
I do have great respect for historical phone systems and the clever engineers making them work. In terms of absolute reliability, I think VoIP was indeed a step back (although I think that’s mainly due to modern engineering and QA practices than inherent limitations).
- ngneer 2y agoExclusively? You make it sound like VoLTE is mandatory. That is not the case, to my knowledge. On a 4G network, for example, one does not always have VoLTE available, and yet one is always able to place voice calls. Since your conviction is palpable, if you could please provide a reference then that would help further the discussion. If not, then no worries, will find the information on my own.
- lxgr 2y ago> 4G and Evolved Packet Core (EPC) architectures do not include support for circuit-switched voice and video calls. Two tracks are available that provide interoperable voice services on 4G smartphones: Circuit-Switched Fallback (CSFB) and VoLTE. (from https://www.ericsson.com/en/reports-and-papers/white-papers/voice-and-communication-services-in-4g-and-5g-networks https://www.ericsson.com/en/reports-and-papers/white-papers/...) Circuit switched fallback means falling back to 3G or 2G (or maybe CDMA) for voice calls; if such networks are no longer available in a given area, VoLTE is indeed mandatory if voice calls are to be supported. (Which is often mandated by regulations, so networks sometimes even block non-VoLTE UEs from attaching.)
- inemesitaffia 2y agoSucks on my phone though I've turned it off.