Avaya 555-245-600 manual 12.7

Traffic engineering

In addition, 37% of intercom calls that are generated in Site 1 are generated by circuit-switched stations, and 69% of those calls are terminated by IP stations. Since 69% of 37% is 25.5%, 25.5% of Site 1 to Site 2 intercom calls are circuit-switched station to IP station. Finally, 37% of intercom calls that are generated in Site 1 are generated by circuit-switched stations, and 31% of those calls are terminated by circuit-switched stations. Since 31% of 37% is 11.5%, 11.5% of Site 1 to Site 2 intercom calls are circuit-switched station to circuit-switched station.

So, since 43.5% of Site 1 to Site 2 intercom calls are IP station to IP station, Site 1 IP station to Site 2 IP station CUR is 43.5% of the 12 Erlangs of overall Site 1 to Site 2 intercom CUR, or 5.2 Erlangs. Similarly, the Site 1 IP station to Site 2 circuit-switched station CUR is equal to 19.5% of 12 Erlangs, or 2.3 Erlangs, and the Site 1 circuit-switched station to Site 2 IP station CUR is equal to 25.5% of 12 Erlangs, or 3.1 Erlangs. Finally, the Site 1 circuit-switched station to Site 2 circuit-switched station CUR is 11.5% of 12 Erlangs, or 1.4 Erlangs.

The values for the remaining COI cells that correspond to intercom traffic for this example are calculated in a similar manner. Table 31: COI matrix for Example 4: Expanded COI matrices (intercom CUR values only) summarizes the results of that exercise:

Table 31: COI matrix for Example 4: Expanded COI matrices (intercom CUR values only)

From endpoints in site ___

					To endpoints in site ___
			1				2			3
		I	C	P		I	C	P	I	C	P
	I	12.7	7.5			5.2	2.3		2.8	0.37
1	C	7.5	4.4			3.1	1.4		1.6	0.22
	P
	I	5.2	3.1			1.9	0.85		1.2	0.16
2	C	2.3	1.4			0.85	0.37		0.54	0.07
	P
	I	2.8	1.6			1.2	0.54		0.78	0.10
3	C	0.37	0.22			0.16	0.07		0.10	0.01
	P

194 Avaya Application Solutions IP Telephony Deployment Guide