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# 215509 30-Jun-2017 11:57
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I see one is selling on eBay http://www.ebay.com/itm/MASTERCALL-MC-4044-/261314827392,  but I still don't understand what it is for.

 

 






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  # 1809496 30-Jun-2017 12:00
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Oh, man, that's a blast from the past. That is a box that you plug two phone lines into, and when a call comes in on one, it calls the other and bridges them. Made for the long ago days before digital exchanges with network-central diversion features. You don't want it, no.





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  # 1809498 30-Jun-2017 12:01
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A telephone call diverter?


 
 
 
 


Stu

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  # 1809500 30-Jun-2017 12:03
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MOTAT or Ferrymead Heritage Park might want to put it on display. Other than that, not much good for anything now.





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  # 1809574 30-Jun-2017 12:50
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Stu:

 

MOTAT or Ferrymead Heritage Park might want to put it on display. Other than that, not much good for anything now.

 

 

 

 

I'm looking at sending it to the Taranaki aviation transport and technology museum.






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  # 1809576 30-Jun-2017 12:51
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jimbob79:

 

Stu:

 

MOTAT or Ferrymead Heritage Park might want to put it on display. Other than that, not much good for anything now.

 

 

 

 

I'm looking at sending it to the Taranaki aviation transport and technology museum.

 

 

 

 

It'll make a good wheel chock, but ideally you'd need a pair.





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  # 1809579 30-Jun-2017 12:53
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SaltyNZ:

 

Oh, man, that's a blast from the past. That is a box that you plug two phone lines into, and when a call comes in on one, it calls the other and bridges them. Made for the long ago days before digital exchanges with network-central diversion features. You don't want it, no.

 

 

If you plug two of those and make one phone go into another and then back into the first one do you get a call loop?





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  # 1809581 30-Jun-2017 13:04
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jimbob79:

I'm looking at sending it to the Taranaki aviation transport and technology museum.



Sounds like a plan.




Keep calm, and carry on posting.

 

 

 

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  # 1809583 30-Jun-2017 13:06
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freitasm:

 

SaltyNZ:

 

Oh, man, that's a blast from the past. That is a box that you plug two phone lines into, and when a call comes in on one, it calls the other and bridges them. Made for the long ago days before digital exchanges with network-central diversion features. You don't want it, no.

 

 

If you plug two of those and make one phone go into another and then back into the first one do you get a call loop?

 

 

 

 

One of those echo loops that get louder and louder and your ears start to hurt a lot? 


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  # 1809620 30-Jun-2017 14:18
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freitasm:

 

SaltyNZ:

 

Oh, man, that's a blast from the past. That is a box that you plug two phone lines into, and when a call comes in on one, it calls the other and bridges them. Made for the long ago days before digital exchanges with network-central diversion features. You don't want it, no.

 

 

If you plug two of those and make one phone go into another and then back into the first one do you get a call loop?

 

 

 

 

Given they only work with dumb exchanges I imagine you just get a busy signal back from the first line. But I did work with a guy at Telstra once who told me about when they were first installing their digital exchanges. Someone did exactly this: there was a diversion from a number off the exchange at Haymarket in Sydney, out to Blacktown, which number was diverted to the original number in Haymarket. 

 

One call to the Haymarket number and - POOF! - two exchanges off the air as CPU went to 100%.

 

I, ah, may have also been guilty of setting up an SS7 route loop once myself, with an SMSC configured to accept only a specific GT and route everything else back to the STP, but the STP was configured to send GT+(any extra digits) to the SMSC. That was fun.





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  # 1809654 30-Jun-2017 15:19
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SaltyNZ:

 

I, ah, may have also been guilty of setting up an SS7 route loop once myself, with an SMSC configured to accept only a specific GT and route everything else back to the STP, but the STP was configured to send GT+(any extra digits) to the SMSC. That was fun.

 

 

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