> ## Documentation Index
> Fetch the complete documentation index at: https://docs.solidyne.ar/llms.txt
> Use this file to discover all available pages before exploring further.

# VoIP Call (SIP)

> Connect to Studios via SIP call

The **SIP CALL** option enables **bidirectional communication or link** through Internet, with **minimal delay**.\
It is equivalent to a conventional VoIP call (similar to Skype or WhatsApp).

It is used when:

* Immediate interaction with studios is required.
* Simple connection is needed on networks beyond your control (public Internet, Wi-Fi at various locations).

Communication is established without complex configurations at either end, even under **limited bandwidth** conditions.

* When configured at low bitrate, it ensures continuity even with restricted Internet.
* When configured at maximum quality, audio is equivalent to direct studio sound.

Operation is simple: a pre-loaded directory shows available contacts. The user selects one and makes the call. At the studio, the operator receives the communication on a compatible computer or equipment. It's also possible to **receive incoming calls from the studios**.

### SIP Operation Procedure

***

<Tabs>
  <Tab title="Making a SIP call">
    <Steps>
      <Step title="Access Connection Center">
        Turn the **encoder** until the **CONNECTION CENTER** screen appears and press it to enter options.\
        You can also access it from the main screen by pressing the encoder.

        <img src="https://mintcdn.com/solidyne/50z9gnJvpK4fhENI/images/mx2200/mx2200_display_connection_center.png?fit=max&auto=format&n=50z9gnJvpK4fhENI&q=85&s=c509fd6e1c488c9b574015b9f5769760" alt="Mx2200 Display Connection Center Pn" title="Mx2200 Display Connection Center Pn" style={{ width:"51%" }} width="256" height="64" data-path="images/mx2200/mx2200_display_connection_center.png" />
      </Step>

      <Step title="Select SIP CALL">
        In the options, select **SIP CALL** and press. The SIP contacts directory will open.

        <img src="https://mintcdn.com/solidyne/50z9gnJvpK4fhENI/images/mx2200/mx2200-connection_center_agenda.png?fit=max&auto=format&n=50z9gnJvpK4fhENI&q=85&s=9c09305111f592a678a13c24525c84a0" alt="Mx2200 Connection Center Agenda Pn" title="Mx2200 Connection Center Agenda Pn" style={{ width:"51%" }} width="256" height="64" data-path="images/mx2200/mx2200-connection_center_agenda.png" />
      </Step>

      <Step title="Choose contact">
        Turn the encoder to select the desired contact.\
        Press to initiate the call.

        <img src="https://mintcdn.com/solidyne/50z9gnJvpK4fhENI/images/mx2200/mx2200-connection_center_SIPcalling.png?fit=max&auto=format&n=50z9gnJvpK4fhENI&q=85&s=9a6392138e690d1831571d193518286f" alt="Mx2200 Connection Center SI Pcalling Pn" title="Mx2200 Connection Center SI Pcalling Pn" style={{ width:"52%" }} width="256" height="64" data-path="images/mx2200/mx2200-connection_center_SIPcalling.png" />
      </Step>

      <Step title="Connection established">
        When the studio operator answers, the display will show **SIP CALL ENABLED**.
      </Step>

      <Step title="End the call">
        Return to **CONNECTION CENTER** and press **SIP CALL** again.

        <img src="https://mintcdn.com/solidyne/50z9gnJvpK4fhENI/images/mx2200/mx2200-connection_center_cortar.png?fit=max&auto=format&n=50z9gnJvpK4fhENI&q=85&s=f05e16e9fe4b5a7f1a5fdc8170ceada2" alt="Mx2200 Connection Center Cortar Pn" title="Mx2200 Connection Center Cortar Pn" style={{ width:"52%" }} width="256" height="64" data-path="images/mx2200/mx2200-connection_center_cortar.png" />
      </Step>
    </Steps>
  </Tab>

  <Tab title="Receiving a SIP call">
    When the studio operator calls the MX2200:

    <img src="https://mintcdn.com/solidyne/50z9gnJvpK4fhENI/images/mx2200/mx2200-display-atender.png?fit=max&auto=format&n=50z9gnJvpK4fhENI&q=85&s=3e7a5558921cd22f44cd57ba8ea175af" alt="Mx2200 Display Atender Pn" title="Mx2200 Display Atender Pn" className="mx-auto" style={{ width:"47%" }} width="256" height="64" data-path="images/mx2200/mx2200-display-atender.png" />

    * The MX2200 display shows a dialog box to **Accept/Reject** the call.
    * A **ring tone plays in CUE**.

    <Warning>
      To receive incoming calls on MX2200, it's necessary to **disable call encryption** in the communications software used.

      In Linphone: *Preferences → Calls and Chat → Encryption = None*.\
      If encryption is active, the console won't be able to take the call.
    </Warning>
  </Tab>

  <Tab title="Studio Return">
    * The MX2200 sends the **Program (PGM)** signal to the Studio.
    * The Studio returns **mix-minus**: floor signal without the console's own signal.
    * The console mixes program signal plus studio return in CUE.
    * The user can remove the PGM signal from headphones to hear only the **Studio return** (see *Monitoring* section).
  </Tab>
</Tabs>

## Receiving MX2200 at the Studios

The SIP call can be received with any compatible system:

* Hardware **DECODERs**.
* **VoIP Software** on PC.

The user can freely choose the SIP service:

* Paid services are recommended for stability.
* Free options are also available, notably [Linphone](https://www.linphone.org).

The **SIP account/contact** assigned to the studio (the contact the console calls) is configured in the decoder.