Caller not hearing call on their end

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Caller not hearing call on their end

Postby goliver » 03/02/2020

A friend of mine with a Fongo app installed tried calling me on my Fongo number yesterday .

I could hear him very clearly but he was not able to hear me .

We are both using Pixel 3a's .

I tried calling him back with the same results

I called him again using a landline (non-Fongo) and had the same results

SMS texts work fine

We later connected using Whatsapp video calling and that worked fine.

Any suggestions on what is happening?
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Re: Caller not hearing call on their end

Postby Liptonbrisk » 03/02/2020

Whatsapp doesn’t use SIP protocol.
Fongo Mobile does.

Were you both using connecting using cellular data? Or was someone using Wi-Fi?

What happens if both of you enable “Alternate Fongo Connection” (under settings) in the Fongo Mobile app?
If that works you, your friend, or both of you are dealing with a SIP ALG issue.

To understand why SIP ALG in routers can cause problems, visit (scroll down to SIP ALG problems) ... quests/new sip-alg/

Alternatively, submit a ticket and ask to have your account checked:
Please do not send me emails; I do not work for nor represent Freephoneline or Fongo. Post questions on the forums so that others may learn from responses or assist you. Thank you. If you have an issue with your account or have a billing issue, submit a ticket here: Visit to check FPL/Fongo service status. Freephoneline setup guides can be found at viewforum.php?f=15.
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