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02-19-2007, 08:16 AM | #1 |
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Bad quality with Voxalot+IPKall
I have an IPKall account that redirect the call to voxalot.com.
When I receive the call the audio is not good. It's fragmented and it cut off sometimes. The caller has an quite bad reception. When I call through Voxalot->Voipdiscount the connection is usually quite good. What is the problem? And how do I solve it? -Cris |
02-19-2007, 08:49 AM | #2 |
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Sounds to me like you might be transcoding too many times.
i.e g711 <=> g729 <=>g711 This situation can occur if you are not setting the right codec values for the provider. For best quality try to set it up to minimise transcoding.
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02-19-2007, 09:10 AM | #3 |
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Thanks for the answer Martin,
IpKall gives you a standard landline phone number in the Washington district here in US for FREE. The path is: Phone line -> IPKall -> Voxalot.com -> My phone ipkall.com don't have a way configure the codec. At least I could not find it. Since I can make calls without any problem (My phone->Voxalot.com->voipdiscount) I think the problem is not between Voxalot.com -> My phone. It should be between IPKall -> Voxalot.com Any idea how to solve it? -Cris |
02-19-2007, 09:21 AM | #4 | |
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Quote:
Allow me to explain: For example if ipkall supports ulaw, alaw and g729 and your phone only supported g729 and you were to put ulaw;alaw;g729 in the provider codec field, what you may find happen is: ipkall <== ulaw ==> voxalot <== g729 ==> phone This is the transcoding I speak of. If however you changed your provider codec setting to just have g729, then one of these 2 pass-through scenarios are likely to happen: ipkall <== g729 ==> voxalot <== g729 ==> phone ipkall <== g729 ==> phone i.e. no transcoding.
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02-19-2007, 10:03 AM | #5 |
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Hi Martin,
Thank you for explaining it. My phone has these codecs in this order: G729a G711ulaw G711alaw G729 G723.1 However I don't know how to find about IPKall. It is NOT in my Provider list. IPKall can be configure using these options: SIP Phone Number: XXXXXX SIP Proxy: us.voxalot.com Email Address: my@email.me Password: 0000 Voice Mail on/off X Seconds to Voice Mail: 20 I had also another problem: if I didn't answer the phone the IPKall voice mail went on instead of the Voxalot one. I changed the secon to VoiceMail... this should solve this problem. - Cris |
02-19-2007, 10:33 AM | #6 |
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I found this http://forum.voxilla.com/ipkall-user...29a-15456.html
They support G729a But I am not sure what happens when IPKall pass the call to Voxalot. It seems that depends on the coded exported by voxalot and the order of them. Cris |
02-19-2007, 10:39 AM | #7 |
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For what it's worth, the last time I checked IPKall will support G729a, but only if it's the only codec on your ATA or phone's list of supported codecs. Otherwise it will choose a different codec like G711u (even if your preferred codec is G729a). I think IPKall will support some other codecs as well, but I'm not sure of the complete list.
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