Cant hear caller when connects

Question

For the past few months, whenever I make a call using Zoiper, the call will dial but when it connects, I hear nothing. The call has connected because I can see that the call timer has commenced. It does the same thing whether I use Localphone or another telephone provider, so I think it is the Zoiper client.

Can you advise if this is a setting wrong or what the problem might be?

My phone is Android (HTC Desire 510) with Zoiper.

Answer 1

If you are using SIP account, please try to enable or disable STUN in account configuration -> "Network Settings".

Do you use TCP or UDP? Please try using TCP if your provider supports it.
You might want to try changing the audio driver in Zoiper -> Config -> Audio settings.

Comments

Thanks for that. The STUN was not enabled, so I enable but now the SIP says "not registered". So I cannot use it. So I think I have to switch off the STUN.

I could not find TCP or UDP through Zoiper -> Config -> Audio

Any other suggestions?

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To change the transport type for your account you need to run Zoiper for Android, go to Config, then go to Accounts, select your account and scroll down to Network Settings. Change the transport type to UDP, TLS or TCP, according to your provider's recommendation.

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Ok thanks. I did try to change to TCP but when I can back into network settings its reverts back to UDP, so looks like that is my only option.

So I am back to square 1.

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Hello,

can you please share which is the exact version of zoiper that you are using?

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Zoiper 1.30 for Android.

Is that the current version?

Answer 2

Hey there! What you are experiencing is a NAT related issue:

- check the Statistics menu while in a call. If incoming packets = 0 then something is blocking audio from remote party

Try to alter STUN and rport. Try different combinations and make some test calls.

Another thing is to make sure firewall device is not blocking/rewriting ports. Default ports are:

SIP port is 5060
IAX port is 4569 UDP
RTP port is between 32000 and 65535 UDP

Default STUN vallues:
Server hostname /IP :stun.zoiper.com
Port :3478 UDP / TCP
Refresh period : 30