Yesterday’s Grandstream UCM Series webinar was a success! Our apologies if you were not able to join the webinar due to it being at our max guest capacity. But no worries, if you missed the webinar, or if you simply want to rewatch it, here is the webinar recording and the Q&A session for your convenience!

Grandstream UCM Series Technical Training Q&A

Question 1: can the UCM be connected to an existing PBX like a Panasonic ns 700 or nec sl-100 to used the feature from the UCM

Answer: Yes, you will need to use Grandstream FXO gateways model GXW4108. We have a white paper on our website


Question 2: How to connect a cellular line to the UCM? Is there a Grandstream device for that?

Answer: You will need a GSM gateway (non-Grandstream) and add it to your UCM as a VOIP trunk


Question 3: Does Grandstream Affinity need to be installed on a PC that is directly connected to the UCM on the same network, if so how does that affect security if someone compromises the PC?

Answer: Yes, Affinity is a Windows-based software that needs to be connected to a PC on the same LAN as the GXP phone. Only models GXP16xx and 21xx supports it. You need to secure your PC as you normally do on normal operations.


Question 4: UCM as Open VPN server?

Answer: No, only as a client


Question 5: Is there a way to have an extension that is outside the PBX on another Asterisk server via SIP URI?

Answer: SIP URI is not recommended for security reasons. If you are sure to use this feature you need to “Allow Guest Calls”. Look for this setting in Sip Settings.


Question 6: where would we go for Grandstream support and documentation?

Answer: You can find more information at Grandstream’s product page and our technical support center.

For more information on Grandstream’s UCM Series please visit the product page or contact Joe Shanahan at 716-531-4316.

Our tech support team at VoIP Supply offers great pre- and post-sales support plus provisioning, consultations, configuration, and installation help. We get a lot of VoIP hardware and software questions and would like to share the solutions with everyone.

In previous Mom’s calling Q&A series, we have discussed: 6 Simple Ways to Fix your VoIP Audio Quality Issues. Today, we have more new real questions and answers from VoIP users just like you.


What is my password for the Grandstream UCM?

Q: What is my admin password for Grandstream UCM?

A: The newer devices will have a sticker on the bottom showing the admin password to log in. This is a good security measure because most of all devices factory set to “admin/admin”, which can be hacked easily.

If the “admin/admin” password isn’t working, then there should be a sticker on that device. If you have forgotten the password, it can be e-mailed to you if you have set this up in the UCM’s wizard. If in fact, you did not set this in the wizard, then you will need to factory reset the device, because there is NO way around this to retrieve their password. The CX will need to start from scratch.



Come back for more VoIP questions and answers next time! If you have VoIP questions to ask us, please submit a technical support ticket or contact our VoIP experts today at (866) 582-8591