Category:VoIP Faults

With most VoIP problems it is best to contact Support. However, here are a few pointers:

Unable to register

The screen of a Snom

• Check username and password carefully. (Typically the username is the full phone number in international format, eg +44.....)
• See the General VoIP settings page for registration details
• See the VoIP clients page to see if your VoIP phone is listed and has any special notes
• Check if your router has a SIP ALG - see: Disable_SIP_ALG

One-way audio

One way audio is usually due to network issues where NAT is in use.

ie, if the IP of your phone is (for example) 192.168.x.x or 10.x.x.x or 172.x.x.x then your phone is probably behind a NAT router.

• Take a look at the VoIP NAT page for help with this and what we'd advise.
• Check if your router has a 'SIP ALG' enabled. Disable this if so. See: Disable SIP ALG

Calls breaking up (intermittent audio)

Generally audio problems such as calls breaking up are due to to the quality of the Internet connected that is being used. Diagnostics should first be concentrated on how well the internet connection is working.

• Try removing everything from your broadband router and directly plug in a single phone in to the router - this will eliminate the local network

Only some calls are getting through

This is a common issue that can occur when you are using multiple phone in a 'natted' environment. We have an article here on this particular issue.

Our support team can also assign you a small block of IPs if necessary.

One-way audio on call recordings

Our call recording system will produce audio with each call participant on separate stereo audio channels. Make sure you are listening with both earbuds in. If you are finding that you are still only hearing one person, then contact our Support team supplying the recording in question.

Sped up or slowed down call recordings

This can happen when you encounter a codec issue on the machine you are listening with. We would suggest using WAV or MP3 for call recordings. This can be adjusted on the Control Panel.