This guide describes how to configure softphone features (SIP) for ProCall Enterprise in conjunction with an Asterisk PBX.

ProCall Enterprise from version 6.3

PBX Asterisk PBX

V 15.5.0

 

Notes on the estos test environment

The softphone functions (SIP) of ProCall were tested in the estos test environment with the telephone system specified above. The tests were performed with a maximum of two lines per SIP end device. The following information was used during the setup of the telephone system for the login/registration of the individual SIP lines to the UCServer.

Note on codecs and UDP connections

For the connection of SIP lines to the UCServer, the telephone system must support the Codec G.711 a-law for the SIP protocol and should have this set as the preferred codec for all end devices.

Only UDP connections are supported.

Note on the use of call forwarding in the UCServer

If the feature Call Forwarding in the UCServer is used, the SIP lines must allow second calls in order to use the feature Call Forwarding on busy.

Configuration of the Asterisk PBX

The setup of the lines to be used for ProCall depends on the interface used, e.g. FreePBX. Basically, these must be created as extensions with the following features:

Type  PJSIP or CHANSIP
Username/SIP-Login  Extension, e.g. 562
PasswordOptional
Codec   G.711 a-law
Protocol UDP

The UCServer evaluates the P-Asserted-Identity in the ReInvite when connecting callbacks. Therefore, make sure that a ReInvite with PAI is sent to the UCServer in such a scenario.

DTMF is mapped via RFC2833.

Configuration of the UCServer

The settings are made in the UCServer administration:

Add telephone system

The connection to the telephone system is entered as a SIP softphone connection under Lines.

Select Asterisk PBX here. 

All SIP lines must be added in the connection setting Properties for line group.

Softphone registration

For the connection to Asterisk telephone systems it is necessary to specify:

Provided: SIP login equals phone number

as usernamethe "call number"
as passwordthe "password" (optional)

    

SIP login not equal to the internal phone number

If the SIP login is not equal to the internal phone number, further configurations are required. 
Here you can find instructions for this special case: Softphone functions (SIP) assign phone numbers

As of ProCall version 6.1.1, please note the following settings

On the line group of the SIP connection, you can define what the UCServer signals to the PBX when:
• the client is not logged in or call protection is activated.
• the call is rejected at the client or no devices are available.
The required settings depend on the telephone system and its configuration.

Example: The telephone system should redirect incoming calls to the mailbox if the ProCall client is not logged in.

Problem: The PBX does not evaluate the busy here (486) sent by default from the UCServer and the calls are not redirected.

Possible solution: In the PBX, this setting is set up for Subscriber Unavailable, and Temporarily Unavailable (480) is selected for signaling on the UCServer.

Version note

Since estos has no influence on the further development of the supported telephone systems by the manufacturer, we cannot guarantee that the instructions described above will also be fully valid for future releases.