No dialtone after upgrading to V20

[Jesperd]

We just upgraded to V20 and now we dont get any dialtone either in the 3CX app or on sip phones anymore, there's just silence until the call gets answered.

After call is answered everything works fine, no audio problems or anything.

Any idea what causes this?


Kind Regards

Kim Andersen

 

[Alphabetic]

Ring tone or dial tone?

assuming you mean ring tone.

does it happen for internal calls?

 

[Jesperd]

Yes ring tone sorry, and it happens for internal calls too yes.

 

[KyriacosS_3CX]

Hi,

We would need to know more details of how everything connects together - but enabling PBX delivers audio might be a quick solution.

 

[Jesperd]

Hi

I've tried enabling PBX Delivers Audio, but that does not change anything.

If i call a number and let it go to voicemail i hear the audio for the voicemail speak just fine, so it seems like audio from 3CX works as intended only the ringtone is missing.

On the network side nothing has changed when we upgraded from V18 to V20.

Its the same problem no matter if the call is from the 3CX app to another 3CX app or to an internal phone.
Its also a problem when making calls between phones on the internal network.

One thing i've noticed that im a bit unsure of wether it was the same before or not is that when initiating a call from the app it looks like call gets answered immediately and the seconds start counting up, but theres complete silence until the other end answers the call.
I cant remember it this was the same behaviour with V18 where the app looks like it answered that call immediately or not.

 

[KyriacosS_3CX]

Do a packet trace / debug log - see if anything is odd their. Also check DNS settings if the devices are all internal - is split DNS / hairpin NAT in place properly?

 

[Jesperd]

Restarting the 3CX services seems to have fixed the issue, thanks for your assistance.

 

[Alphabetic]

was gonna say that next