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Re: call forwarding without being involved in the loop possible?

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On 2021-03-26 04:00:00 +0000, yan...@gmail.com said:

> Hello all,
> 
> I know almost nothing about telecommunication, and google also did not 
> result in much details about "call forwarding" technology.
> 
> My question is, is it possible, say, after A called B, and B call 
> forwarded the call to C, and then B is NOT involved in the loop 
> anymore? In other words, A is now "directly" connected to C, and B is 
> NOT in the loop and is impossible to record the conversation. Even 
> better, B won't be charged for the minutes of the conversation between 
> A and C because B is NOT in the loop anymore.

OK, that isn't call forwarding. That's call transfer, and there are two 
types, blind and supervised.

With call forwarding, party B is never in the voice path. A dials B and 
is routed to C without B answering.

Blind call transfer works like this. A calls B. A and B converse. B 
transfers A to C. C's phone rings and when answered is connected to A.

Supervised call transfer. A calls B. A and B converse.B initiates the 
transfer, A goes on hold. B and C converse. If C accepts the call, B 
hangs up and A and C converse. If C says they don't want to talk to A, 
then B takes A off of hold and makes up some excuse why C isn't 
available.

Whether the machine doing the transfer/forward can eavesdrop depends on 
the type of system. With most SIP systems the transfer is done with a 
re-invite and media then can flow from A to C without being in the loop.

PBX systems are in the loop and can be configured to eavesdrop.

Conventional landlines will generally keep the local switch in the loop.

Cellular carriers are obviously in the loop if any two of the three 
parties are subscribers and likely in the loop even if not.
> 
> The reason I am asking this is that, it is one of the possible 
> solutions of my startup business in language interpreting service. A 
> typical scenarios is that, a nurse in a clinic encountered a Spanish 
> speaker who does not understand English well, and the nurse called my 
> business asking for a Spanish interpreter, then my business will 
> forward the call to a language interpreter (selected in real time from 
> available Spanish interpreters on my online platform).   In this 
> scenario, I want myself be out of the loop once the call from the nurse 
> is forwarded to an interpreter, so that I do not need to deal with 
> HIPAA compliance issue anymore.  The conversation between nurse and 
> Spanish patient is protected by HIPAA, so I want myself be out of it, 
> i.e. there is NO way for me to record the conversation.  (Assuming I do 
> have other methods to record the minutes of the conversation, so that I 
> can charge the clinic by minutes).

Consider a SIP carrier, hosted VoIP. Media won't be anchored to your or 
your interpreter's location once you release. They can provide you with 
near real-time call records for billing. Many will allow you to enter a 
client code on your phone's keypad that shows up as part of the call 
record for billing. 

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call forwarding without being involved in the loop possible? "yan...@gmail.com" <yan.xxs@gmail.com> - 2021-03-25 21:00 -0700
  Re: call forwarding without being involved in the loop possible? Jay Hennigan <nobody@example.com> - 2021-09-25 22:56 -0700
    Re: call forwarding without being involved in the loop possible? "yan...@gmail.com" <yan.xxs@gmail.com> - 2021-09-26 23:01 -0700

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