The Nortel NCDS Multimedia Communication Server(MCS)5100 3.0 (exam code 920-139) is the exam you pass to earn the Nortel NCDS (Networking Communication Design Specialist) certification, a credential at the Professional level. If you are mapping out a certification path with Nortel, this exam is a milestone worth planning around.

No strict prerequisites officially published; typically requires foundational knowledge of IP telephony and Nortel VoIP systems.

Eligibility rules can be adjusted by Nortel over time, so before you register, confirm the current requirements on the official exam page.

Yes. 2Pass4sure offers a free PDF demo of the 920-139 practice questions, so you can judge the quality of the material firsthand before paying anything. Every purchase also includes 365 days of free updates — if Nortel changes the exam during that year, your material changes with it. And when the free update period expires, you can extend it at a 50% discount from within your member zone.

Every 920-139 purchase at 2Pass4sure is backed by a 100% Money Back Guarantee: if you take the corresponding exam within 60 days of your purchase and do not pass, you can apply for a full refund. The guarantee has clear conditions — it does not apply if you sit the exam within 3 days of purchase, if you downloaded the material but never actually took the exam, or to free materials and expired orders, and the candidate name must match the payer name. To file a claim, send a scan of your exam enrollment slip together with your official Score Report PDF within 2 days of the exam; claims are processed within 7 days. If you would rather not take a refund, you can exchange the product instead and receive two additional exam preparation products of equal value for free, while your original product keeps its update service. Delivery itself is instant: your material is available for download right after payment and is also sent to your email within one minute — if it has not arrived within 2 hours, contact our customer service. There is no limit on how many computers you can install it on.

The official Nortel NCDS Multimedia Communication Server(MCS)5100 3.0 outline divides the exam content into 4 main domains. The first three are:

• Call Control and Signaling
• MCS 5100 Architecture
• Operations and Maintenance

That is only the headline view — scroll back up to the Exam Topics section on this page for the complete domain-by-domain breakdown before you plan your study schedule.