Matrix Sparsh VP110 User Manual page 352

• Intermittent voice is mainly caused by packet loss, due to network congestion, and jitter, due to message
recombination of transmission or receiving equipment (e.g., time-out handling, retransmission mechanism,
buffer under run).
• Noisy equipment, such as a computer or a fan, may cause voice interference. Turn off any noisy
equipment.
• Line issues can also cause this problem; disconnect the call and redial.
What is the difference between a remote phone book and a local phone book?
A remote phone book is placed on a server, while a local phone book is placed on the IP phone flash. A remote
phone book can be used by everyone that can access the server, while a local phone book can only be used by a
specific phone. A remote phone book is always used as a central phone book for a company; each employee can
load it to obtain the real-time data from the same server.
What is auto provisioning?
Auto provisioning refers to the update of IP phones, including update on configuration parameters, local phone
book, firmware and so on. You can use auto provisioning on a single phone, but it makes more sense in mass
deployment.
How to reboot the IP phone remotely?
IP phones support remote reboot by a SIP NOTIFY message with "Event: check-sync" header. When receiving a
NOTIFY message with the parameter "reboot=true", the IP phone reboots immediately. The NOTIFY message is
formed as shown:
NOTIFY sip:<user>@<dsthost> SIP/2.0
To: sip:<user>@<dsthost>
From: sip:sipsak@<srchost>
CSeq: 10 NOTIFY
Call‐ID: 1234@<srchost>
Event: check‐sync;reboot=true
What is PnP?
Plug and Play (PnP) is a method for IP phones to acquire the provisioning server address. With PnP enabled, the
IP phone broadcasts the PnP SUBSCRIBE message to obtain a provisioning server address during startup. Any
SIP server recognizing the message will respond with the pre-configured provisioning server address, so the IP
phone will be able to download the CFG files from the provisioning server. PnP depends on support from a SIP
server.
Why doesn't the IP phone update the configuration?
Do one of the following:
344 Matrix SPARSH VP110 User Guide