Error of testing MMSC Routing

Error of testing MMSC Routing SearchSearch
Author Message
Ada Chiu
New member
Username: Ada211

Post Number: 10
Registered: 02-2021
Posted on Tuesday, April 27, 2021 - 09:14 am:   

Dear Supporting team,

I used Windows 10 Pro system, Huawei 3G modem and PCCW mobile operator. When I wanted to testing send test MMS message, it had errors. However, it can send SMS message. Please refer to attached images and help me to solve it. Thank you.
error images
error images
Bryce Norwood - NowSMS Support
Board Administrator
Username: Bryce

Post Number: 8444
Registered: 10-2002
Posted on Tuesday, April 27, 2021 - 09:54 pm:   


Those are the settings defined for the operator CSL:

I understand that PCCW = CSL, so I believe those settings are correct.

It appears that we have been fighting this same problem for almost 2 months (, so I am not optimistic that we can resolve this issue.

I will offer three different possible paths:

1.) Use an Android phone as a modem instead of the Huawei device. Quick start guide:

Basically, an app gets installed on the Android phone and NowSMS communicates with the app to send/receive SMS and MMS.

We generally recommend using an Android phone as a modem as a preferred solution for sending/receiving MMS, as compared to a dedicated modem device.

The problem with dedicated modem devices is that the mobile operator assumes that the device is being used to provide mobile internet connectivity. The device's IMEI (unique id/serial number of the device) identifies it as a modem. Some operators implement APN overrides, and when a modem device connects, they are routed to an APN that only provides internet connectivity, but does not offer data connectivity for MMS. (Data connectivity for MMS is internal to the operator network.)

By contrast, an Android device is a phone, and data connectivity for MMS will not be blocked in such a way.

Even in environments where modems are not blocked from sending MMS, using an Android device to send/receive MMS is much faster than using a modem device as a modem device is using a serial interface which usually has a top speed of 110Kbps to 220Kbps.

I strongly recommend trying an Android device as a modem instead of the Huawei modem device.

2.) If you want to keep attempting to use the modem, try a SIM card from a different mobile operator.

3.) To further troubleshoot your current configuration, on the "Serial #" page in NowSMS, enable the MMSWAPDEBUG.LOG. Stop and then start the NowSMS service.

Try sending another message, and then collect the contents of the MMSWAPDEBUG.LOG. This will allow us to see, in more detail, what is happening with the data connection attempt. This may provide some new information.


Bryce Norwood
NowSMS Support

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