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I was wondering if there are any general settings or configuration changes that can be made for a user of Zoiper in an area with very low (under 1Mbps) Internet connection speeds?

Currently we have tested inbound and outbound calls and while they are stable, there appears to be a lot of dropped packets, especially inbound.

Not sure if you need any further details but here are the basics;

  • Installed Zoiper Free version (testing stage)
  • The account is using SIP
  • Internet connection: 0.9 Mbps Down and 0.2 Mbps up.

Thanks in advance for your help!


in Android by (160 points)

1 Answer

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Best answer


First thing to check is to make sure the other side has a jitter buffer enabled, it will have a lot of impact (zoiper has an automatic jitter buffer, no need to make changes on the zoiper side).

How many simultaneous calls do you want to do ? If you want to do a lot, calculate the bandwidth needed with something like this:

I would suggest to:
- use a codec that uses not too much bandwidth (e.g. g729, gsm, ilbc, speex).
- use a codec that handles packetloss (iLBC)

If your server supports OPUS, sign up for the zoiper 5 beta test from as it has good error correction in case of packetloss.

The next thing you can do is do some QOS tagging (in the hopes that the rest of the network will support it).

Have a look here:
( I would suggest to do the marking based on the destination IP = the server ip).

Good luck!
by (11.5k points)
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Wow! That is just perfect, thank you Joachim!

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