QOS – MQC

by | Feb 20, 2010 | IOS, Non classé, QOS, Written Theory | 0 comments

Here is as short recap/representation of the MQC ( Modular QoS CLI)

Step #1 : Classify Traffic => CLASS-MAP

Step #2 : Assisgn Policies to the traffic classes => POLICY-MAP

Step #3 : Apply the policy to an interface => SERVICE-POLICY

Erlang

by | Feb 19, 2010 | Non classé, Uncategorized, Written Theory | 0 comments

An Erlang is defined as 1 hour of conversation.

Erlangs = Hours_of_phone_use_in_a_month/22 * 0.15 *1.10

  • 22 represents the number of businness day per month
  • 0,15 represents 15 % of phone system usage occuring during busiest hour
  • 1,10 adds 10 % for call processing overhead

MGCP Transport Layer

by | Feb 19, 2010 | CUCM, MGCP, Non classé, Written Theory | 0 comments

MGCP is Master/Slave protocol and MGCP endpoints are controlled by the Control Agent ( Most of the case , it will be the CUCM)

MGCP uses the UDP/2427 for its communication between the CUCM and the GW. It is also a text-based master/slave protocol used by a media gateway controller (MGC) and Call Agent to control media gateways. However , TCP/2428 is used to exchange keepalives between endpoints and Call Agent, as well for MGCP PRI/BRI backhaul.

MGCP MGCs and MGs can be described as follows:

  • MGC/Call Agent: this element possesses call control intelligence and controls MGs (example : Call Manager)
  • MG: This device provides translation between data packet and audio signals reveived over VoIP networks and other networks such as the PSTN ( example: IOS gateway)

SCCP/Skinny Transport Layer

by | Feb 19, 2010 | CUCM, Non classé, SCCP, Written Theory | 0 comments

As defined for SIP , here are the transport layers used by Skinny/SCCP Protocol:

  • TCP Connection with CUCM
  • UDP Connection between the endpoints

SCCP is a Cisco proprietary protocol master/slave protocol that Call Manager and other call agents can use to communicate with devices and endpoints as Cisco IP Phones.
SCCP uses port TCP/2000 and TCP/2443 for SCCPS

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