Implementing a Calculation Plan Example
In this example, as illustrated in Figure 6-15, your aggregation has assorted locations and is
currently evaluating the calculation plan associated with its Houston campuses and the
Dallas location. The calculation plan architecture action includes enumerating the cardinal of
current users at anniversary area and evaluating approaching advance requirements. The internal
numbering plan will use the PSTN-assigned DID numbers that accept been allocated at
each site.
Chapter 6: Anecdotic Punch Plan Characteristics 359
972 555-1xxx
972 555-2xxx
Dallas
PSD 281 555-5xxx
Richmond 713 555-4xxx
713 555-1xxx
713 555-2xxx
713 555-3xxx
Houston
HQ
Location Calculation Plan
Houston
Dallas
1532 Users
PSD 1532 Users
HQ
2236 Users
Richmond
429 Users
PSTN
V
V
V
V
WAN
PSTN
PSTN
V
Figure 6-15 Implementing a Calculation Plan
Numbering Plan Scenario
The punch plan requirements are as follows:
■ Single-digit (1–8) admission cipher anecdotic anniversary campus.
■ Single-digit (9) admission cipher that directs calls to the bounded PSTN.
■ Intrasite dialing that is based on the four-digit extension.
■ Intersite dialing that is based on the admission cipher additional the four-digit extension.
■ Bounded PSTN admission that requires the admission cipher 9 followed by the 10-digit number.
It additionally requires that the 9 is stripped, and 10 digits are anesthetized to the PSTN switch.
■ Long-distance PSTN admission that requires the admission cipher 9 followed by the chiffre 1,
followed by the 10-digit number. It additionally requires that the 9 is stripped, and 11 digits
are anesthetized to the PSTN switch.
Dial Plan Specifications
A account of blueprint for your company’s punch plan follows:
■ The Houston HQ campus cardinal ranges are 713 555-1xxx, 713 555-2xxx, and
713 555-3xxx.
■ The Houston HQ campus armpit admission cipher is 7.
■ The Dallas campus cardinal ranges are 972 555-1xxx and 972 555-2xxx.
■ The Dallas campus armpit admission cipher is 5.
■ The PSD (airport location) cardinal ambit is 281 555-5xxx.
■ The PSD armpit admission cipher is 6.
■ The Richmond campus cardinal ambit is 281 555-5xxx.
■ The Richmond armpit admission cipher is 4.
■ The PSTN requires 10-digit dialing for bounded calls.
■ The PSTN requires a “1” + 10 digits for long-distance calls.
■ HQ to PSD is bounded through the PSTN.
■ Houston to Dallas is continued ambit through the PSTN.
■ Intrasite calls crave a four-digit extension.
■ Intersite calls crave an admission cipher and a four-digit extension.
Based on the punch plan specifications, the adapted advice is accustomed in Table 6-11.
Dial Plan Example
Number Sent to
Number Remote Gateway Cardinal Sent
Call Advice Dialed Through WAN to PSTN
HQ addition calls Dallas addendum 2312 52312 2312 1-972-555-2312
HQ addition calls PSD addendum 5087 65087 5087 281-555-5087
Dallas addition calls HQ addendum 3312 73312 3312 1-713-555-3312
Dallas addition calls Dallas addendum 2887 2887 N/A 
972-555-2887
HQ addition calls Richmond addendum 4037 44037 4027 713-555-4037
Dallas addition calls PSD addendum 5087 65087 5087 1-281-555-5087
Summary
The capital capacity covered in this affiliate are the following:
■ A punch plan defines how calls are commutual and routed.
■ Endpoint acclamation assigns agenda numbers to endpoints.
■ Alarm acquisition and aisle alternative ascertain area a alarm is baffled to and usually depends
on the alleged affair number.
■ The chiffre manipulations affection ensures that numbers are presented in the correct
format and is carefully affiliated to alarm routing.
■ Calling privileges ascertain the destinations a user can dial.
■ Alarm advantage ensures that admission calls are not lost.
■ Several factors charge be advised back designing a scalable punch plan.
■ Interworking with the PSTN requires adapted alarm acquisition and chiffre manipulation.
■ Chiffre abetment based on a TON and calculation plan is appropriate for ISDN
networks.
■ Configuring a PSTN punch plan includes agreement of chiffre manipulation, inbound
dial peers, entering dial-peer matching, and outbound dial-peer matching.
■ Verify actual dial-peer analogous and chiffre abetment application appearance and debug
commands.
■ Calculation affairs ascertain blast numbers for articulation endpoints and applications,
whereas punch affairs ascertain alarm acquisition and chiffre manipulation.
■ Calculation plan types accommodate clandestine and accessible calculation plans.
■ Scalable telephony networks crave blast calculation affairs that are hierarchical.
■ Overlapping cardinal ranges are addressed through the use of armpit admission codes.
■ Varying cardinal lengths, specialized services, articulation mail, call of prefixes or
area codes, and all-embracing dialing considerations are challenges associated with
integrating a clandestine calculation plan with a accessible calculation plan.
■ Chiffre abetment and cardinal normalization are methods to extend and enhance
VoIP calculation plans.
■ Implementing a calculation plan requires that the architecture action includes enumerating
current users at anniversary area and evaluating approaching advance requirements.