ISDN Dial Plan Requirements

ISDN Dial Plan Requirements

When you are application ISDN trunks, added requirements ability exist:

■ Correct PSTN entering ANI presentation depending on TON: Some ISDN networks

present the entering ANI as the beeline dialable cardinal accumulated with the

type of cardinal (TON). This analysis of the ANI raises an affair because simply

prefixing the PSTN admission cipher ability not aftereffect in an ANI that can be alleged back.

The abeyant botheration can be apparent by able chiffre abetment on gateways.

■ Correct PSTN outbound ANI presentation depending on TON: Some ISDN networks

and PBXs ability apprehend a assertive calculation plan and TON for both DNIS and

ANI. Application amiss flags ability aftereffect in abridged calls or amiss DNIS and ANI

presentation. Again, chiffre abetment can be acclimated to break these issues.

Inbound ISDN Alarm Example

Figure 6-6 shows a alarm breeze for an entering ISDN call.

A armpit consists of an H.323 aperture that is controlled by Cisco Unified Communications

Manager Express. The DID ambit of the PSTN block is 408555XXXX, and phones use

the addendum ambit 01XX. The action of the entering ISDN alarm is as follows:

1. A PSTN user in Chicago with the cardinal 512 555-0101 dials 1 408 555-0101.

2. The aperture receives an ISDN bureaucracy bulletin with the DNIS 4085550101 and the

ANI 5125550101 TON National.

Call Bureaucracy From

PSTN:

ANI 5125550101

TON National

Phone1-1

0101

Phone2-1

0102

Gateway

15125550101

H.323 Alarm Setup:

ANI 915125550101

Gateway Prepends

91 to ANI Due to TON

1

2

3

Phone 1-1 Rings.

ANI 915125550101

San Jose

DID

Figure 6-6 Entering ISDN Call

3. Based on the ANI TON, the aperture prefixes 91 to the ANI (9 as the PSTN access

code and 1 as the civic identifier).

4. The alarm is baffled to Phone 1-1, and the calling cardinal is displayed: 915125550101.

A user who misses the alarm can anon alarm aback application the absent alarm directory

without any modification.