#2
This is because by default the Siemens phone does not have the DTMF signalling we use set.

You can change it with this information:


Changing the default DTMF Mode

If you're having problems accessing voicemail or IVR menus, you will have to change the default DTMF Mode:

1. On the Siemens handset press: Menu, 5, 5, 6, [enter the default PIN 0000] - Press OK

2. Make a note of the IP you see on the screen, disregarding any starting zeros. For example -

If you see 192.168.001.002 - note down 192.168.1.2. If you see 010.000.000.002 - note down 10.0.0.2.

3. Visit the IP address you see in a web browser on your computer, Internet Explorer for example. It should look something like this in your address bar: http://192.168.1.2

4. You'll be prompted for your System PIN - Enter 0000 and click OK

5. Navigate through, Settings, Telephony, Advanced Settings.

5. Under 'DTMF over VoIP Connections' ensure ONLY RFC 2833 is ticked - Click Set.

6. You're done - Try calling 1571 and check the pressing of options is working for you.
Regards,

Voipfone Customer Services

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