Enable DTMF transfer on phone via asterisk

I need some help with a special VoIP Project.

The current state is pretty simple and straight forward.

Just a PBX with 4 extensions, and a trunk. All works well.

This is shown in the diagram as 'Before'.

One SIP phone however is very special.

It doesn't have a transfer button. So no call transfer can be initiated on the phone.

It should be possible however to initiate a transfer via DTMF tones.

The current PBX (main PBX) doesn't support tranfser via DTMF.

This is the tricky part: I *think* we need to put asterisk in between the main PBX and the phone.

I *think* Asterisk should be able to listen for DTMF tones and initiate a transfer to the main PBX if the correct DTMF sequence is entered on the phone.

I need someone who can tell me if this scenario will work, or suggest another solution.

Also i would like to hire this person to help me implement it.

Link to diagram: [login to view URL]

Skills: Asterisk PBX, VoIP

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About the Employer:
( 10 reviews ) Venlo, Netherlands

Project ID: #17839180

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I have lots of experience in asterisk and pbx, I am sure i can resolve your issue. I offer my services for your project. We can chat details.

€75 EUR in 3 days
(10 Reviews)

3 freelancers are bidding on average €71 for this job


i full stack developer with more the 10 years the experiencie on Voip with asterisk , kamailio, freepbx. i can help you with your issue.

€61 EUR in 1 day
(11 Reviews)

Hi. I'm a asterisk/VoIP consultant with 10+ years of hands on experience in open source & Linux platform and also the below mentioned applications, servers & interfaces. - Installation & configuration of Asterisk ba More

€77 EUR in 3 days
(11 Reviews)