TRB500 cannot send text/SMS messages

Networking Solutions
1

Hi There,

My brand new TRB500 cannot send text messages. Its still in NAT mode, sim is unlocked, APN is detected and its working like a charm, however sending text messages through the web interface result in “Failed to send message”

when trying through CLI:

root@TRB500:~# gsmctl -S -s "+31610000000 test"
[gsmctl_send_sms:22] error: ERROR: Failed to parse response

I already tried in enabling and disabling Volte, but this is not changing the issue.

i’ve called with teltonika support (Justinan).

  • We tried to replace the +31 with 0031 in the number format
  • We tried to change the SMS center number, @Justinan, i’ve checked for our wholesale provider Enreach “+31686899900” is correct :slight_smile:

Justinan advised to create this topic to troubleshoot this further

2

i’ve more updates..

To make sure its not the SIM itselt, i tried the SIM in an iPhone, and yes it works! It can receive and send SMS text messages (and yes, the green messages, not the blue imessages hah)
I don’t think its relevant, but the subscription is a data-only subscription, meaning thats it not having a standard +316 number but a +31970 number. However SMS is working, receiving and sending!

I’ve tried the same SIM in another Teltonika device (RUTX50 fw: RUTX_R_00.07.16.3) and expierence the same behaviour. The device can receive SMS without problems, sending is still an issue.

4

Hello,

For troubleshooting purposes, we will require more sensitive information from your end, such as the troubleshoot file, which may contain passwords, public IP addresses, serial numbers, and such. To avoid leaking this information, we have sent you a form to fill out, which you will receive in your e-mail inbox that you have registered your account with in the forums. In the Ticket ID field of the form, please enter the ID of this thread, which is 16187.

Thank you,
Justinas

5

I can send SMS from a TRB500 with a +3197 number (Odido) to a +316 number without problem…

6

Great intel @r.janssen !

just to be sure, you also have a Teltonika device with a 3G/4G/5G radio (no 2G fall-back)

7

Yes, the TRB500 is configured for 5G/4G/3G and it detects 5G (NSA) network (4G/5G transitional mode), Odido does not have a 2G network.

8

New update!
I’ve investigated the capabilities of our wholesale provider Enreach, who deliver their services on both the KPN and VodafoneZiggo networks in the Netherlands.

They explained that they don’t provide configuration support for specific end-user equipment (UE), so they couldn’t advise directly on how to configure the Teltonika device.

However, they clarified how SMS over IP (SMSoIP) works on their network.
According to Enreach, devices that no longer support 2G can still send SMS messages over IP, as long as they register on the IMS APN (which runs parallel to the regular internet APN).

They also explained the following technical procedure, which is part of the standard IMS stack:

  • The device should register on the APN called ims
  • The username should be the IMSI, followed by the domain:
    • For KPN users:
      @ims.mnc003.mcc204.3gppnetwork.org
    • For VodafoneZiggo users:
      @ims.mnc004.mcc204.3gppnetwork.org

So in my case (KPN network):

APN: ims  
Username: {IMSI-HERE}@ims.mnc003.mcc204.3gppnetwork.org

During registration, the UE (User Equipment) will receive an unauthorized response containing a nonce, which must be used together with the SIM’s key, to compute the correct authentication response.

Once successfully registered on the IMS APN, the UE can send SMS messages using SMSoIP by sending a SIP MESSAGE to the SMSC:

sip:+31686899900@ims.mnc003.mcc204.3gppnetwork.org;user=phone

The exact message format is defined in 3GPP standards, and any UE capable of SMSoIP should handle this automatically.

In short, their network relies on SMS over IMS, not traditional circuit-switched SMS.
Devices like the Teltonika TRB500 would therefore need IMS registration and SIP MESSAGE support to send SMS successfully.

My conclusion so far:
I cannot determine whether the IMS APN (as parallel with the internet APN) is correctly set up or even supported within the Teltonika device.

Hopefully someone can shed some light on this!

9

Interesting… On the Odido network I have never setup anything for SMS, it just worked. I have only set an internet APN (fms) instead of the default one, but before I did that it worked as well.

Probably different providers have different requirements, like an SMS gateway that does not require authentication?

10

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