voice passages cisco

Presentation 

Cisco IP telphony entryways empower Cisco CallManager to speak with non-IP media communications gadgets. Cisco CallManager underpins a few kinds of voice passages. 

Entryway Control Potocols and Trunk Interfaces 

This segment portrays the passage control conventions and trunk interface conventions that are upheld for designing doors in Cisco CallManager. 

•Gateway control conventions give the inner interface between the voice passage and Cisco CallManager. 

•Trunk interfaces indicate how the passage interfaces with voice gateways cisco the PSTN or other outside gadgets. 

Passage Control Protocols 

Passage control conventions give correspondence and control between Cisco CallManager and the voice entryway. 

The sum and kind of data that you arrange in Cisco CallManager Administration versus what is designed on the door change, contingent upon whether passage control convention is MGCP, H.323, or Skinny: 

•Media Gateway Control Protocol (MGCP)— When MGCP is utilized, Cisco CallManager controls directing and tones and offers valuable types of assistance to the passage. MGCP gives call safeguarding (calls are kept up during failover and failback), excess, dial plan improvement (no dial peer setup is needed on the passage), hookflash move, and tone on hold. MGCP-controlled entryways don't need a media end point (MTP) to empower valuable administrations, for example, hold, move, call pickup, and call park. See Table 34-1 for entryway models that help MGCP. 

•H.323 Protocol—The Cisco IOS coordinated switch entryways utilize the H.323 convention to speak with Cisco CallManager. See Table 34-1 for passage models that help H.323 convention 

Contrasted with MGCP, H.323 requires more arrangement on t.he passage, on the grounds that the door should keep up the dial plan and course designs. 

•Skinny Gateway Protocol—Older Cisco voice entryways, for example, the AT-2, AT-4, AT-8, AS-2, AS-4, AS-8 utilize Skinny Gateway Protocol. 

•Skinny Client Control Protocol—Cisco VG248 Gateway enlists and speaks with the Cisco CallManager by utilizing the Skinny Client Control Protocol, which likewise permits uphold for upgraded highlights, for example, Message Waiting Indication. The Cisco VG248 Gateway underpins bunching and failover. 

Trunk Interfaces 

Gadget conventions determine the time-division multiplexing (TDM) flagging interface between the voice entryway and the PSTN or outside non-IP communication gadgets. Upheld TDM interfaces shift by entryway model. The accompanying rundown gives accessible interfaces: 

•Foreign Exchange Office (FXO)— Use FXO ports for interfacing with a focal office or PBX. You can design circle start, ground-start, and E&M flagging interfaces, contingent upon the model that is chosen.