Until recently, I was unable to get VoLTE going with the L5 on Optus in Australia. Optus advised that technically there was no reason from their end why it should not work, so I went back to Purism support, requested and received the instructions for updating the modem bm818 firmware, and since the update, VoLTE has worked just fine. Though I am getting a new behaviour: whilst the incoming voice is very clear, it occasionally cuts out and I lose a few words before it cuts back in. I don’t recall this happening before under 3G, but for the moment I am blaming this on the caller’s handset …
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Would you be able to report here what modem firmware version you are now running?
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The phone was originally delivered with (according to the BM818 tool):
M100E_YCSN0_1.0.0_210830
YCSN0_M100E_1CMD_B227_V1.0.0.1_20210907
M100E_1.0.4_200715
After the firmware update, it is now
M100E_YCSN0_1.0.0_220926
YCSN0_M100E_1CMD_B227_V1.0.0.2_20220930
M100E_1.0.4_200715
Firmware needed a couple manual power offs and restarts to kick in.
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One of the Optus support pages indicated that Optus may need to enable VoLTE for your account. When I contacted them they indicated that it was already enabled (at their end) for mine. Just saying; in case the firmware update doesn’t work, check with Optus to see if the switch is off for your account. Optus were very professional and supportive at all points, and the phone (L5) and modem (BM818) being new to them was not an issue.
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That’s interesting. I have VoLTE enabled on my account and also with the BM-818 tool and still cannot get a VoLTE call to happen.
M100E_YCSN0_1.0.0_220926
YCSN0_M100E_1ACD_B325_V1.0.0.2_20220930
M100E_1.0.4_200715
This is my modem firmware, slightly different than yours.
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I’m not sure of the meaning of the ‘1CMD_B227’ -vs- ‘1ACD_B325’ difference, but these strings appear in other posts here so not a serial number, and didn’t change when I upgraded firmware so not firmware version. Maybe related to the modem variant (E1/A1/T1)? Mine is T1, what is yours, and are we still talking Australia here?
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Sorry I’m in Canada, but my VoLTE isn’t working either so just trying to see if there is any commonality between our countries. When you make a call is it defaulting to HSPA?
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When making calls the L5 used to drop from 4G to 3G and the BM818 tool would show HSPA. Once the call had ended, the indicator would return to 4G. Since the firmware update it stays on 4G and the tool shows either ‘FDD LTE’ or more commonly ‘TDD LTE’ during calls.
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Hi @alistair23 Newbie here doing as much reading as I can before choosing my next phone. Am happy enough with Vodafone here in Perth. And interested how VoLTE experience is holding up? Is it stable enough for a daily driver?
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FWIW, Telstra has delayed the 3G shutdown by 2 months (from June 30 to August 31). That is of course not motivated by the Librem 5 but the effect is that if you are using a Librem 5 on the Telstra network, you have an extra two months to get VoLTE sorted out.
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My experience on the wholesale Telstra network (ALDI), when receiving calls the VoLTE calls work on the L5, but NOT when calling out from the L5. It reverts to 3G. As you say, we have nearly 4 months to figure this out.
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It’s stopping me pulling the trigger and ordering one 
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It’s stopping me pulling the trigger and ordering one
It has just worked correctly staying in 4G with an outgoing call. Will watch it over the next fortnight to see if it is consistent
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