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PC_MAC

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We have a smaller Kerio appliance and have recently noticed that when doing calls, sometimes the line will be silenced to person on the other end. This period of complete silence will happen for about 20-30 seconds and the person cannot hear or talk to the other person on the other end.

Also, when on a conference call, all people are silenced (not on purpose) randomly and the one person talking doesn't know and keeps on talking.

Strangley, it seems like the silence can be ended however by putting the silenced phone on Speaker phone, or another sound output.

Anyone else having this problem? Anyone have a solution?


Our Setup:
15 Users on Kerio Appliance (smaller box) with Phonebooth.com as the SIP trunk provider. We have about a 5/1 down and upspeed connection for the box.
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Vladimir Toncar (Kerio)

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Looks like the phone stops both sending and receiving audio packets when it's silence detection kicks in. What phones do you use? I would use the built-in packet sniffer to see what happens on the wire - whether the RTP really stops flowing.
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PC_MAC

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It happens most when everyone is called into a conference line on their cell phones - without using a softphone. We are just using the default cell phone interface. Could one person's silence detection silence everyone else, because that is what seems to happen?

The problem with Packet sniffing is that it is vary random when it happens and it would take forever to capture that random behavior and then to analyze that much data.

Do you have thoughts on why cell phones would cause this?

Thanks,
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Vladimir Toncar (Kerio)

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So the call just uses the cell network and there's no SIP client on the phone? Do you know what is your SIP carrier's policy regarding silence detection or are you using some SIP-GSM gateway?

Vladimir
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PC_MAC

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i would have to check the SIP carrier's policy however, we are not using a GSM Gateway. Our service is through Bandwidth.com.
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PC_MAC

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Unfortunately the Carrier said they don't monitor for silence detection and it would not be caused by their settings. I did a packet capture today but it was very large - it may take a long time to analyze (16 Mb). When briefly looking at it, nothing stands out. However I am no expert in deciphering that information.
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Vladimir Toncar (Kerio)

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In Wireshark, just use the tool under Telephony -> VoIP calls. It will identify individual call legs, you can display message exchange graphs, or even play audio.

You can also send the packet dump to us, I will create FTP credentials for you.

Vladimir

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PC_MAC

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Muted Problem[ 2 votes ]
1.You have had this problem. 1 / 50%
2.Never Had this problem 1 / 50%

Please respond to this poll about a silence issue. I want to see if anyone else has ever experienced this.

Thanks!
Adam

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