No voice when connecte from outside the LAN

Asterisk Asterisk Support
1

I installed Asterisk on a Raspberry PI 4 with a 3G dongle to connect a sip client with cellular line.
I use MIZUDROID as the client software.
When I connect from the same LAN it works excellent - I can get calls and it works as I wanted.

When I am outside the LAN - I use a private VPN to connect to my line (base on wireguard).
When I use the VPN my cellular phone can access other computers on the LAN and as an internal IP.
When I run MIZUDROID it says it is registered - and If I call the SIM number of the dongle I get the call in MIZUDROID including caller id. I can also answer - But the issue is that there is no voice.
I can’t hear the other side and he can’t hear me.

Any suggestion ?

2

Which channel driver are you using?

What are its public address and local network settings?

3

Sorry but I don’t know what is channel driver.

About the second question - I guess you mean in the General SIP settings ?
I just saw that they are no set
Because I am using VPN - I guessed that my phone is inside the LAN - and it works when connected with wifi - shouldn’t it work also from outside with VPN ?

I don’t want to open ports in my router except the wireguard vpn port.
Is there any reason I should set the external address and local networks in the NAT settings in General SIP settings ?

4

There is no such thing in Asterisk. Are you using some GUI? If so, please use the forum for the GUI, e.g. https://community.freepbx.org for FreePBX.

Channel driver refers to anything in the channels directory in the source code, e.g. chan_dahdi, chan_skinny, chan_iax, chan_sip, chan_pjsip, etc., etc. There are two channel drivers for SIP, of which only one is currently supported, chan_pjsip.

5

New to Asterisk and still get confuse with the right notations

I am using chan_pjsip

What does Asterisk do with the public address and local network ?
How does it influence its behavioral ?

6

If there is a public address for signalling, and the destination isn’t on a local network, it sets the addresses in the Via and Contact headers to the public address, rather than the address of the interface used. With a public media address, it does the same except for the media address.

If you have a public address but fail to list the VPN as local, the public address will be, incorrectly, used for traffic over the VPN.

7

I did my homework - and local network wasn’t defined and the public address was wrong.
I updated it and now it works !!

As all access from outside is with VPN - I guess I don’t need public address and only local network is important ?

I also defined iax2 extension - and it also works - I think iax doesn’t need this local network definition ?

The strange thing is that I wanted to check it again - so I removed the local network and it still works
But I can’t complain as the goal achieved.

Thank you

8

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