How to set up automatic switching between SIP / GSM modes in a multiphone?

Question

Asterisk

In a corporate environment telephony from Megafon is used. We want to connect a multiphone in order to be able to monitor incoming calls. Therefore, at the time of processing the phone at the BPX level, before forwarding the call further to the same mobile number, you need to switch the "SIP" option to "GSM", otherwise it goes not to the mobile, but to the same PBX. And after the connection, return the multiphone settings for the number back to "SIP".
Tell me please, is it difficult to implement something similar using Asterisk, or maybe there are ready-made systems that allow you to implement such a scheme?

Answer 1

Set up the SIP + GSM reception mode in the multiphone
https://sm.megafon.ru/sm/client/routing/set?login=...

Answer 2

You can do it as above, but then incoming gsm will be annoying.
request with Curl will save you. It can be done directly from the
dialplan www.voip-info.org/wiki/view/Asterisk+func+curl

Answer 3

I want to upset ... but the multiphone switches with a delay ... sometimes more than 10 minutes :(