Services Configuration

pascom Default Settings

Before our VoIP Software can be put into operation, it is necessary to configure a few default settings. Within the web UI, click on Appliance > Services and for now remain in the tab Basic Data:

Setting Description
Hostname pascom Hostname (Per default pascom) unless modified by you
Domain-Suffix Your Domain-Suffix
Primary Nameserver Internal or external DNS Server
Secondary Nameserver Additional DNS Server - optional
Notification address E-mail address of an employee or e-mail distributor which should receive notifications from pascom
Sender address The e-mail address from which pascom can distribute e-mails

Mail Server

pascom includes a mail server. It should be configured so it can forward e-mails to your SMTP server.
You can either manage your own SMTP server or have your provider run such a service for you. For a successful configuration, you need to know the IP or domain name of the SMTP server you intend to use. In addition, it may also be necessary to (particularly if you are using the SMTP server from your provider) authenticate with a user name and password.

The mail server is required to send voice mails, faxes, recordings of phone conversations etc. via e-mail.
To enable this, create a mail account for pascom on your mail server. This account will only send e-mails, not receive e-mails.


To configure the mail server, go to the Web UI and select Appliance > Services > E-mail Server:

Setting Description
Visbile Domain Name Enter section of your e-mail address after the @ symbol
Mail Server for forwarding pascom does not send e-mails directly to the corresponding destination server, but rather uses a forwarding (relay) server
Should a different port other than 25 be used, enter this port here as in the following example:
SMTP User and Password optional setting, which is required for SMTP authentication

Test Settings

To test the correct working of your mail server, use SSH to log on to your pascom and become the root user. Send a test e-mail using the following command, whereby should be replaced with your desired address:

 admin@pascom:~$ echo Test | mail -s Test

You can also check the mail server’s log file, using the command below and your system password:

root@pascom:/etc/admin# tail -f /var/log/exim4/mainlog

This will return several lines allowing you to check whether the e-mail was successfully sent using your SMTP server.

2016-03-16 12:21:14 1NrUpm-0007gQ-Dk <= U=admin P=local S=368
2016-03-16 12:21:14 1NrUpm-0007gQ-Dk => R=smarthost T=remote_smtp_smarthost H=ihr.mailserver []
2016-03-16 12:21:14 1NrUpm-0007gQ-Dk Completed

NTP Server Configuration

Many pascom processes are time controlled. For example, calls could be routed differently at different times. pascom also automatically manages the time on all IP telephones. Therefore, it is important to configure a NTP server to ensure proper time synchronization

If you do not have your own NTP server, you can use the publicly available service at

Enter the NTP Server address in the pascom web UI under Appliance > Services > NTP Server.

Encrypted Telephony via SRTP

The RTP (Real-Time Transport Protocol) is a protocol which facilitates the transmission of multimedia data streams over a network. In IP telephony, it is used in order to transmit both audio and video streams for a call. pascom is able to encrypt the transmissions via SRTP (Secure RTP)

SRTP configurations can be set under Appliance > Services > Telephony

The following SRTP settings are available:

Setting Description
Deactivated As default SRTP is deactivated
Activated for all supported devices Support devices, which can be provisioned by pascom (Snom, Yealink, Aastra (mitel), Auerswald, OpenStage and pascom Softphone)
Activated for all supported devices and any IP phone/softpone SRTP will be activated for all supported devices and any IP phone or softphone.
Please note that devices that are not provisioned by pascom, SRTP must be manually activated on the device itself. Should you not do this, then it could be that it can no longer be called when SRTP is activated in pascom.

As standard SRTP can only be activated for IP phones / Softphones and not for Gateways. When SRTP is activated in pascom, only internal calls will be encrypted and not calls that are externally routed over a gateway or a SIP provider.

When activating / deactivating SRTP, the Asterisk will be restarted, meaning all current calls will be disconnected. Therefore all hardware phones must be restarted (-> Device List) and all pascom Clients using Softphones must be restarted.