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VoIP Phone System Guide to VoIP Network Integration

VoIP Phone System Guide to VoIP Network Integration

VoIP Phone System Guide: VoIP Network Integration

Continuing on in our VoIP phone system guide, this article focuses on VoIP Network Integration. In other words, we are getting to grips with the question of how to integrate your IP PBX (VoIP phone system) into your existing infrastructure. Compared to a legacy PBX in which the telephones are connected via a separate network, IP based systems offer a number of advantages. For example, you need only maintain one network and a host of additional functions are available such as desktop and mobile UC applications plus the option to connect to CRM / Ticket systems or phone books is always available. Beyond this, with an IP PBX (or VoIP phone system software) voice calls are no longer transmitted over traditional telephone lines, such as the ISDN or POTS, but rather sent in encrypted packet form over the Internet.

A typical VoIP software based phone system is a hugely comprehensive product that includes a multitude of features. These range from Auto Attendant automatic answering functions and advanced call and contact centre tools such as Skills Based Routing through to the features required to video telephony and conferencing. So create a list of all the features that are essential for you, your employees and your customers and you will be some way to deciding which solution is right for you. You will also likely notice that there are a number of integration options which are based of different frameworks which we will cover in more detail. Moreover, we will separately cover which important functions are must haves and should be offered by a VoIP telephone system.

How to choose the right VoIP software solution?

A professional telephone system will support your business in portraying a high value professional image to your customers. The phone system configuration and applications available will have a decisive influence on how professionally you manage your call volumes, making choosing the right business communications platform essential to ensure the optimal performance and benefits are gained. This is as true for larger organisations as it is for small business and start-ups. Perhaps it is even more essential in the highly competitive SOHO / SMB segments where business need to stand out from the crowd in order to succeed.

How many employees should use solution?

Not every solution presented below is ideally suited to every business. For example, choosing a cloud solution has many advantages such as lower cost to entry for startups and SMBs but not for a production house that requires on-site hardware for health and safety reasons. A general rule of thumb is that a cloud solution is ideal for businesses up to ca. 25 employees. However, that is not to say that larger companies should ignore the cloud. There are considerably more benefits to Cloud solutions than simply lowering upfront costs.

If your business has reached a certain size, the technology itself almost plays a secondary role. What comes to the fore with our customers is the need to centralise and standardise the communications platform. It is, however, often the case with large enterprise that the company has a central HQ that is fully independent of the smaller business locations. As a result, the branch locations will generally have an in-house IT team who manage an on-premise phone system – whether virtual or hardware based. As a result, for large enterprise customers it is important to find a solution that enables them to integrate a centralised communication solution and with pascom this can be achieved using both our on-premise and cloud solutions.

Option A: Integrating into an Existing Company Network

In particular, it is relatively straightforward to integrate a new phone system directly into small and medium sized networks as such integrations only require relatively minor modifications to the existing IT landscape. If you have a pre-existing DHCP server, this can be used for and by the telephone system. Alternatively, pascom on-premise VoIP solutions come with an inbuilt DHCP server that can be utilized by the complete network or configured to be used only by the phone system and desktop phones.

Most modern IP desktop phones are equipped with an internal switch (gigabit has become the standard). This can be used to connect the phone directly to a workstation PC or to integrate further endpoints to the network. This can save excess cabling and is particularly useful when there is an insufficient number of LAN ports available on the network.

Option B: Separate Telephony and Company Networks

For maximum flexibility and operational security, the telephone system should be deployed and run inside a telephony network separated from the company network. Such network architectures offer a multitude of benefits including:

  • Problems with bandwidth assignment (Quality of Service) and conflicts with existing network services can be avoided. A notable example is avoiding your telephony traffic becoming affected by high volume usage on the company network.
  • Access to the telephony network can be controlled via a Firewall.
  • Some VoIP phone systems, such as pascom’s, deliver a DHCP server interface for the telephony network, meaning no additional DHCP service modifications are required on the company network.

It is not necessary to physically separate the two networks. Modern switches offer the benefit that so-called VLANs - Virtual Local Area Network - can be setup. This makes in possible on a 48 port switch for example to connect all phones on ports 1-24 and on ports 25-48 all workstations.

Option C: Integration and Migration of an Existing Telephone System

Top of the range IP phone systems like pascom’s can be connected to an existing ISDN telephone system with relative ease. This allows for a step-by-step move away, or soft-migration, from the ISDN system to the new modern IP solution IP should for example an immediate switch out of endpoints not be possible or extremely impractical.

Such integrations should only be undertaken after careful consideration, particularly as a soft migration involves two phone system solutions to be maintained simultaneously which requires additional resources in terms of manpower and man-hours.

Option D: Switch to a Hosted Cloud Phone System

Use of the term cloud phone system or cloud PBX is becoming more and more mainstream in the world of telecommunications and there are plenty of scenarios in which a hosted or cloud PBX delivers a number of advantages over the on-premise variations. The questions remains however, what should the required network infrastructure look like?

In terms of networking, the cabling required for a cloud solution is relatively similar to that required by an on-premise phone system. You will require a router with internet access and depending on the size of your company, a number of switches to connect workstations and / or desktop phones. The difference lies in once the initial set up and software installation has been completed. From this point on, you should not incur any administrative overheads.

Network Summary

How you choose to construct your network is entirely up to you. A competent VoIP phone system provider will also have a good knowledge concerning network infrastructures and will be able to advise you on the setup.

In principle, you can cancel your existing conventional landline connection or migrate the account to a SIP provider. With a VoIP software based telephonysolution, you will be able to almost immediately start making IP calls over the Internet to the PSTN, from you mobile or via video Internet telephony. However, it is recommended to check beforehand if any other endpoints or terminals in your fleet of devices require access to the conventional landline.

A business phone system is more than just a server and a few desktop phones. Thanks to the interconnecting PCs, work locations, desktop phones and mobile devices, a first-class business VoIP phone system will offer you a high degree of comfort. You will require IP compatible phones. IP telephones communicate using the same network technology as PCs – namely IP or Internet Protocol. Options such as the CTI interface for connecting phones and PCs will only function with IP phones and therefore ensure the out dated ISDN endpoints become obsolete.

As mentioned above, it is possible to migrate or port your existing phone numbers from the ISDN to a VoIP provider, quite often free of charge. However, you should inform your current provider in advance and set the porting process in motion.

For more information regarding pascom VoIP solutions and the move to ALL IP, contact us and our team will be happy to advise on the best solution for your business.

Thousands of companies trust pascom to stay connected


Philipp Meixner, CEO
As a communications agency with just under 20 employees, the pascom phone system is perfect for us. The technical concept simply functions, which is what you want. The service is exceptional and always accessible (even if it is rarely needed) and as one of the agency’s business partners, we can only recommend pascom: open, straight forward, pleasant to work with - great. Thank you pascom!


Stephan Förderung, CEO
We chose pascom because their phone systems offer a sleek, easy to use UC client and administration UI whilst providing us with all the PBX and UC features, control and visibility that we could possibly need from our business communications solution. As a result of our excellent experience, we are happy to recommend pascom phone systems to all our customers.


Lars Hoeger, IT Director
When we make decisions regarding new systems, we want to make sure that we have both reins firmly in our hands. Therefore, it is essential to implement systems which adhere to OpenStandards, allowing us to seamlessly connect and integrate these to our existing systems. In addition, we require reliable suppliers, who are ready to customise their solutions to our requirements, which is why we chose pascom who offer exactly this service and more.


Kassandra Martin, Deputy Director & Reception Manager
We chose pascom as our telephony solution in part due to the scalability, flexibility and ease of deployment. In addition, the pascom platform functions perfectly with our digital guest directories in our rooms whilst offering the largest range of features at easily the most cost effective price compared to alternative solutions. A further deciding factor was the wide choice of compatible hardware that choosing pascom afforded us.

Wake & Camp Ruhlsdorf

Markus Gerlitzki, Managing Director
My team and I pride ourselves on the level of excellent care we provide our guests. However, it can be distracting when the phone is always ringing and we constantly answer the same questions. Thanks to the pascom phone system, we have been able to setup an automated self-service hotline which allows guests to quickly get answers and if required callers can be quickly and efficiently routed to an an employee. The system greatly improves customer service with around the clock answers around opening times and courses and therefore reduces the strain on employees, ensuring we are free to cater to the needs of our on-site guests.

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