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What is the network look like, what switches are being used. Is data being shared on the same lan? Can you get a wireshark trace? Specifically I'd like to have three wireshark on the drop of a phone that consistently fails. This might tell us if network congestion is blocking the packets. Since this traffic is UDP out is a best effort so if the network can't get the invite packet to the phone the phone can't participate.
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What is the network look like, what switches are being used. Is data being shared on the same lan? Can you get a wireshark trace? Specifically I'd like to have three wireshark on the drop of a phone that consistently fails. This might tell us if network congestion is blocking the packets. Since this traffic is UDP out is a best effort so if the network can't get the invite packet to the phone the phone can't participate.

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The issue was solved by configuring the paging in multicast mode,then create a new CNF-file and finally reset all phones.
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The issue was solved by configuring the paging in multicast mode,then create a new CNF-file and finally reset all phones.

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<div class="content wysiwyg-content">
Hi All<br />
<br />
I have a UC560, CME version 8.1 with 20 phones, some phones are SPA504 (7.4.8a)<br />
&nbsp;and others are SPA525G2 (7.4.9a)<br />
<br />
Here it is the paging-dn config:<br />
<br />
ephone-dn &nbsp;1<br />
&nbsp;number 101 no-reg primary<br />
&nbsp;description IP-Paging1<br />
&nbsp;name Office Page<br />
&nbsp;paging ip 239.1.1.1 port 2000<br />
<br />
The strange behavior I get is that not all phones are receiving the paging and this occur randomly between phones, sometimes one phone works fine and sometimes it doesn't.<br />
<br />
Thanks for any help
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Hi All

I have a UC560, CME version 8.1 with 20 phones, some phones are SPA504 (7.4.8a)
 and others are SPA525G2 (7.4.9a)

Here it is the paging-dn config:

ephone-dn  1
 number 101 no-reg primary
 description IP-Paging1
 name Office Page
 paging ip 239.1.1.1 port 2000

The strange behavior I get is that not all phones are receiving the paging and this occur randomly between phones, sometimes one phone works fine and sometimes it doesn't.

Thanks for any help

Paging not working for all ip phones randomly (UC560)(8.1)

Voice over IP (VoIP) is a methodology and group of technologies for the delivery of voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. Other terms commonly associated with VoIP are IP telephony, Internet telephony, broadband telephony, and broadband phone service. The term specifically refers to the provisioning of communications services (voice, fax, SMS, voice-messaging) over the public Internet, rather than via the public switched telephone network (PSTN).  Examples of the VoIP protocols are H.323, Media Gateway Control Protocol (MGCP), Session Initiation Protocol (SIP), H.248 (also known as Media Gateway Control (Megaco)), Real-time Transport Protocol (RTP), Real-time Transport Control Protocol (RTCP), Secure Real-time Transport Protocol (SRTP), Session Description Protocol (SDP), and Inter-Asterisk eXchange (IAX).

Voice Over IP

IP telephony (Internet Protocol telephony) is a general term for the technologies that use the Internet Protocol's packet-switched connections to exchange voice, fax, and other forms of information that have traditionally been carried over the dedicated circuit-switched connections of the public switched telephone network (PSTN). Using the Internet, calls travel as packets of data on shared lines, avoiding the tolls of the PSTN. The challenge in IP telephony is to deliver the voice, fax, or video packets in a dependable flow to the user.

IP Telephony

A router is a networking device that forwards data packets between computer networks. Routers perform the "traffic directing" functions on the Internet. The most familiar type of routers are home and small office cable or DSL routers that simply pass data, such as web pages, email, IM, and videos between computers and the Internet. More sophisticated routers, such as enterprise routers, connect large business or ISP networks up to the powerful core routers that forward data at high speed along the optical fiber lines of the Internet backbone. Though routers are typically dedicated hardware devices, use of software-based routers has grown increasingly common.