RTU5025 SMS but no call

Forums › Mobile handsets › RTU5025 SMS but no call

Ge0rge

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#324161 8-Mar-2026 14:03

I've picked up an RTU5024 4GLTE Gate Opener to replace the 3G unit that no longer works.

I've been playing around setting it up today, the majority of which has been by SMS - you SMS it a code, and it responds that it has received said code. This has been working fine - I can activate the relay via SMS, add numbers to the authorised list, allow any number to open the relay etc, and the unit sends an SMS back.

However, I don't appear to be able to call the device and have it activate the relay. It goes straight to voicemail (with 2 degrees), and there is no response from the unit - no lights activating, no SMS to say the relay has been triggered..

The SIM in the unit has credit, is active and is on a plan.

Thoughts or suggestions please?

jamesrt

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#3467788 8-Mar-2026 14:10

Have you tried calling the number of the SIM if/when it's in a phone?

Can you make an outbound call is the SIM is in a phone?

Is there a shortcode to check if call redirect is active? [I don't recall...]

Ge0rge

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#3467880 8-Mar-2026 17:41

The SIM is able to make and receive calls no problem when in a phone, and it seems to receive and send SMS ok when in the gate opener - just not receive calls.

Linux

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#3467881 8-Mar-2026 17:47

@Ge0rge Does the unit support VoLTE if not then no Voice calling!

Edit:

The standard RTU5024 is a 2G-only device, but newer 4G-specific versions (often branded as

4G LTE GSM Gate Openers) exist, though they often lack active VoLTE support.

danfaulknor

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#3467882 8-Mar-2026 17:48

It needs to support VoLTE for calling to work - I did a bit of a search and it's a bit of a mixed bag. Some articles say it doesn't support it, some say it does.

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#3467884 8-Mar-2026 17:52

@Ge0rge Simple answer you have purchased a unit that supports 4G but no VoLTE support

Ge0rge

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#3467978 9-Mar-2026 06:16

Bugger, that's disappointing.

Guess that's relegated to e-waste. The WAF of sending an SMS to open the gate is very low.

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coffeebaron

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#3468000 9-Mar-2026 08:15

Try a prepay SIM from each provider, sometimes you get lucky and find it will work with at least one of our networks.

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#3468006 9-Mar-2026 08:41

coffeebaron:

Try a prepay SIM from each provider, sometimes you get lucky and find it will work with at least one of our networks.

Zero chance if the unit does not have VoLTE support

Wiil work on SparkNZ for another 2 weeks only

Uncly

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#3478855 7-Apr-2026 15:50

Ge0rge:

I've picked up an RTU5024 4GLTE Gate Opener to replace the 3G unit that no longer works.

I've been playing around setting it up today, the majority of which has been by SMS - you SMS it a code, and it responds that it has received said code. This has been working fine - I can activate the relay via SMS, add numbers to the authorised list, allow any number to open the relay etc, and the unit sends an SMS back.

However, I don't appear to be able to call the device and have it activate the relay. It goes straight to voicemail (with 2 degrees), and there is no response from the unit - no lights activating, no SMS to say the relay has been triggered..

The SIM in the unit has credit, is active and is on a plan.

Thoughts or suggestions please?

I have replaced a few RTU5025 4g, since the 3g termination. They do the same . Text receive,replay but no call response. I find the RTU5024 4g models are ok though