[IMP] VoIP: Update DIDWW

Clarified a few points during the configuration process in the DIDWW side. Included information about requesting DIDWW sales team for access to the required transport protocols to meet Odoo VoIP requirements. This should help clarify common issues during this setup and avoid common issues.

Adding DID Number configuration screenshot for DIDWW VoIP documentation.

closes odoo/documentation#14965

Signed-off-by: Felicia Kuan (feku) <feku@odoo.com>

content/applications/productivity/voip/didww.rst

@@ -54,6 +54,10 @@ Configure or add the following parameters:
 - :guilabel:`Default media type`: `SRTP-DTLS`
 - :guilabel:`Transport protocol`: `UDP`, `TCP`, `WSS`, `TLS`
 
+.. important::
+   The SRTP media encryption and TLS SIP transport are disabled by default in DIDWW. Contact the
+   DIDWW sales team sales@didww.com to allow traffic encryption for your account.
+
 .. image:: didww/sip-device-route.png
    :alt: The settings for a new contact method in DIDWW.
 
@@ -63,6 +67,12 @@ Configure or add the following parameters:
    then click :guilabel:`My Numbers`. Scroll to :guilabel:`Configuration`. In the :guilabel:`Inbound
    voice trunk` field, select :guilabel:`phone.systems`.
 
+Lastly, verify that the DID number is selected in the *Inbound Calls* section of the SIP Device
+Route settings.
+
+.. image:: didww/did-number.png
+   :alt: The DID numbers field in DIDWW.
+
 Odoo setup
 ==========