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How is the IMS involved in eCSFB?

I'm not certain it actually is. I can't find anything that confirms it, so I may be mistaken. My understanding though was that eCSFB and IMS were coupled together (maybe IMS sends the initial message to switch to CDMA?). The closest I could find was the last page of this thread http://www.s4gru.com/index.php?/topic/5001-Breaking-Band:-Tri-band-LTE-/-eCSFB-issues-thread

 

Sent from my Nexus 6

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I'm not certain it actually is. I can't find anything that confirms it, so I may be mistaken. My understanding though was that eCSFB and IMS were coupled together (maybe IMS sends the initial message to switch to CDMA?). The closest I could find was the last page of this thread http://www.s4gru.com/index.php?/topic/5001-Breaking-Band:-Tri-band-LTE-/-eCSFB-issues-thread

 

Sent from my Nexus 6

Huh. What's weird is on my att iPhone, in settings>general>about there is a thing called "IMS Status" and its value is "Voice & SMS" but I can't seem to find that on my sprint iPhone. I have also seen this on tmo and vz iPhones...

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Huh. What's weird is on my att iPhone, in settings>general>about there is a thing called "IMS Status" and its value is "Voice & SMS" but I can't seem to find that on my sprint iPhone. I have also seen this on tmo and vz iPhones...

That's because Sprint doesn't send SMS over wifi calling on the iphone. It says only "voice" in that field on a sprint variant.

 

 

Sent from my iPhone 6+ using Tapatalk

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