![]() ![]() ![]() If this fails, the IP phone moves to thenext server in the configuration file. The Cisco IP Phone attempts to contact the first call processing server (the primaryserver) listed in its configuration file to register.Included in the configuration file is a listof valid call processing agents (such as Cisco Unified Communications Manager orCisco Unified Communications Manager Express CME agents). After the Cisco IP Phone has the IP address of the TFTP server, it contacts the TFTPserver and downloads its configuration file.This option directs the IP phone to a TFTP server. In the case of Cisco IP Phones, a unique DHCP option is = Option 150. DHCP options include items such as default gateway, DNS server information, domain name information and so on. When the Cisco IP Phone acceptsthe offer, it receives all the DHCP options that goes along with the DHCP request. The DHCP server responds with an IP address offer.The Cisco IP Phone sends a DHCP request asking for an IP address on its voice VLAN.The Cisco IP Phone now knows what VLAN it should use. As the Cisco IP Phone powers on, the Cisco switch delivers voice VLAN information to the IP phone using CDP as a delivery mechanism.If the IP phone and switch support PoE, the IP phone receives power through either Cisco-proprietary PoE or 802.3af PoE. The Cisco IP Phone connects to an Ethernet switchport.I also added few basics of ISDN troubleshooting. Cisco phones are connected to the switch and managed via CME or CUCM.īelow, you'll find basic ways and commands to troubleshoot VoIP issues. Much depends on the connection and hardware you're working with. Let's take a closer look at Cisco connections and troubleshooting of basic problems. Now, with VoIP technology, we face new issues. Phone hacking has been around since creation of the phone line. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |