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knorman
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PostPosted: Tue Sep 16, 2008 9:59 pm    Post subject: Call forwarding problem: 3-4 seconds of no audio Reply with quote Back to top

I'm having an annoying, yet somewhat tolerable problem (tolerable because it's temporary) -- For the next 2 weeks or so, I need my Vonage number to forward to a different number. My RTP300 adapter will be completely offline during this time. I've already had it forwarding for the past week and a half.

What I've noticed is that anytime a call is forwarded from my Vonage number to the other number we're using in the meantime, we can't hear anything for about 3 - 4 seconds after we answer. This leads to a confusing "Hello? Hello? Is anyone there?" exchange on every incoming call, where the caller can hear us, but we can't hear them. After the first few seconds, things are normal again.

When I try calling the temporary number directly, we don't have the problem. It's only when calls get forwarded through the Vonage number. Since the phone adapter is offline, I have tried using both the "Network Availability Number" type of forwarding, as well as traditional "Basic Call Forwarding" with the ring time set to "Instant".

Because this situation is temporary, there's no point to giving the other number out to people who may call us, but it's extremely annoying. Has anyone else noticed a similar problem?
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nitinsood
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PostPosted: Fri Sep 19, 2008 12:55 pm    Post subject: Reply with quote Back to top

+1.

I have noticed the same behavior - even when the Vonage adapter is online and the call is just being forwarded to my cellphone.
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DLevenson
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PostPosted: Fri Sep 19, 2008 7:48 pm    Post subject: Reply with quote Back to top

I have never had this problem with Vonage, but I have experienced delayed audio cut-through on calls forwarded by some other carriers over the years. It is usually caused by a delay in the propagation of supervisory signaling from the called party.

In other words, when you answer the incoming call, the fact that you have gone off-hook is detected by the carrier serving the phone you answered (or by the cellular service provider who receives the radio signal from your cell phone when you answer it). This signal (called answer supervision) is passed by that carrier to the carrier who passed the call to them. If that is not the carrier from whom the call originated, it must then pass the same signal back to the carrier from whom it received the call, and so forth. The originating carrier, in some cases, does not cut through forward audio until they receive answer-supervision. If that signal is delayed, you experience the symptom you describe. The larger the number of intermediate carriers in a particular call, the more severe the problem.

This does not happen on all calls because of differing network architectures. If, for example, all of the intervening carriers are connected via the SS7 signaling network, then call-forwarding may pass the call directly to the terminating carrier, bypassing the intervening carrier who might have initiated the call-forward request. Also, some originating carriers do not block forward audio while awaiting the called party's answer.

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mundy5
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PostPosted: Sun Sep 21, 2008 7:14 am    Post subject: Reply with quote Back to top

if you explanation is accurate, DLevenson, then a delay is virtually unavoidable in such situations. that's a shame but again, 3-4 secs is a tolerable lag. most calls overseas are like that without any call forwarding.

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DLevenson
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PostPosted: Sun Sep 21, 2008 5:30 pm    Post subject: Reply with quote Back to top

mundy5 wrote:
if you explanation is accurate, DLevenson, then a delay is virtually unavoidable in such situations. that's a shame but again, 3-4 secs is a tolerable lag. most calls overseas are like that without any call forwarding.


The delay of several seconds happens in cases where one or more of the intervening telco switches or circuits delays the propagation of the supervisory signal. This is unusual. When it is happening, it is difficult to find and fix, because of the number of different entities involved.

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