SIP adapters work very well with our voip services. If you experience audio problems when using our phone service, we recommend that you check your Internet connection and audio codecs. With our services, you can use the G711u, G711a, PCMU, PCMA, ULAW, ALAW and G729 codecs.

With other voip provider, you must use only the audio codecs authorized by your operator. Keep in mind that only authorized codecs should be active if you want to have good audio quality. Disable any other codec available in the codec list. If your device does not allow you to disable the audio codec, first place the authorized codecs.

Some tips to help you:

Dial *98 to check if you hear the mailbox correctly.
Check the volume of the phone connected to the adapter.
Check the volume of the adapter.
Check that only the audio codecs listed above are active.
Change the position between the active codecs in the list.
Give priority to the codecs listed here: Codecs: G711u, G711a, G729, ULAW, ALAW, PCMU, PCMA.
Check that your firewall is not blocking the adapter traffic.

NB: Your SIP adapter does not have these codecs, use the codec your have in this list and available in your SIP adapter.

If the problem persists after these checks, you should make sure that your router does not block audio traffic. If you use our VoIP services or are registered on our site, open a support ticket and we will help you solve the problem.