No ringing back when calling

[wujingke]

When I made an outbound call, there was no reply.

[IchthysMaranatha]

First make sure modem is working using minicom without asterisk, you should be able to place calls and answer them. Then follow this

[wujingke]

I can make a call, but there is no ringing sound after dialing. There is a sound when the call is answered, and there is a sound when the call is rejected. There is no ringing back after dialing.

[IchthysMaranatha]

Which modem? Have you followed the test bed setup?

[IchthysMaranatha]

Sorry, saw your pic now

[IchthysMaranatha]

Try uac mode also

[IchthysMaranatha]

And troubleshoot using only one modem

[wujingke]

Activate UAC but still no ringing sound

[IchthysMaranatha]

If you have something like pulseaudio that will prevent asterisk from taking control.

First run testbed setup on new fresh ubuntu install according to steps given without any additional software and identify source of issue.

[wujingke]

There is just no ringing back. There is sound when connected, which is very strange.

[wujingke]

The system is newly built

[IchthysMaranatha]

All done according to test bed with nothing extra?

[IchthysMaranatha]

Please follow this without any deviation #13

[wujingke]

According to the documentation, no other additions

[IchthysMaranatha]

What do asterisk logs say?

[IchthysMaranatha]

What does quectel show device quectel0 say?

[wujingke]

[wujingke]

[wujingke]

Found the problem

Add in asterisk's sip.conf
directmedia=no
prematuremedia=yes
progressinband=never

[IchthysMaranatha]

Had you done this from guide?

In settings make sure network is set to bridged adapter

This ensures that all devices are in same network connected to your router without asterisk having to proxy. If it needs to proxy, directmedia=no

[wujingke]

After testing, it was found that when the called party has activated a ring tone, the operator returns 183 and sends rtp. When the called party does not have a ring tone, the operator sends 180 and does not send rtp, so there is no ring tone back. Is there any good solution for this? The module will not return 180 or 183

[IchthysMaranatha]

You can force asterisk to generate ringback with r option in Dial

[wujingke]

After forcibly setting the ringback tone, the machine is shut down and the prompt tones such as empty numbers cannot be heard.

[IchthysMaranatha]

When building asterisk, have you included all sounds needed with relevant codec?

[IchthysMaranatha]

Also you might need to set up indications.conf