[Asterisk-Users] PSTN Incoming call on real line disrupts VoIP call over DSL circuit

[Jerry Jones]

I would guess either the DSL itself is bad or perhaps the dsl Modem.  
perhaps calling Bellsouth would be helpful? Does other Internet  
traffic get interrupted also?


On May 8, 2006, at 1:42 PM, Hadar Pedhazur wrote:

> I haven't seen anything this strange, and it's 100% reproducible.  
> I'm hoping that there are some clever ideas out there for what to  
> look for, since I can test to my heart's desire on this one...
>
> My Dad lives in Florida, and has a Bellsouth DSL line. Of course,  
> he has a regular POTS line connected on the same line. He has the  
> appropriate filters on every jack that has a phone connected to it,  
> and he even replaced one or two of them (when I thought that was  
> the problem).
>
> I sent him a HandyTone GS-486 (HT), configured to connect back to  
> my Asterisk server. He only has a single computer in his apartment,  
> so it's connected into the HT, and the HT is connected into the DSL  
> modem.
>
> He can make and receive calls on the HT, and the quality is  
> excellent. If he's speaking via the HT (meaning a VoIP-only call)  
> and the "real" phone rings, everything continues fine  
> (temporarily). If the real phone is answered, either by a person,  
> or by the answering machine (which is in another room, connected to  
> a filter on another jack), then the audio on the Asterisk  
> conversation becomes _one way_. My father can be heard _perfectly_  
> by the remote side of the conversation, but he can hear nothing.  
> When the POTS line is hung up, then both sides of the VoIP call go  
> dead (audio-wise). Of course, he can now redial a VoIP call, and  
> both sides work perfectly...
>
> At first, I couldn't imagine that it was anything other than a bad  
> filter, but other than replacing the filter (which didn't help),  
> nothing else stops working. He can continue to use the Internet  
> connection on his PC just fine, and I can continue to hear him  
> speak over the VoIP connection with no problems either, so the  
> Internet connection has not been lost.
>
> I have to admit to being completely clueless as to what to even  
> look for, so _any_ advice as to things to test for would be  
> appreciated. As I said at the top, I can reproduce this 100% of the  
> time, so I can easily setup any debugging environment in advance,  
> and trigger the problem at will, etc.
>
> Thanks in advance!
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