Overview
This page aims to provide an overview of common pstn configurations in Switzerland. In Switzerland PSTN connectivity is provided by multiple carriers, mostly via ISDN. FXO is also provided but mostly to residential customers. SIP and H.323 Trunks are provided by some carriers.
Dialplan
The Swiss dialplan is a variable length numbering plan, which consists of area codes and subscribers numbers. Area Codes are 3 digits in length, subscriber numbers have 7 digits. Service Numbers have 3 or 4 digits. Some numbers (mostly used by companies) allow the use of Direct Inward Dial Extension. In this case, a direct dial code of 4-7 digits is assigned to the company, allowing extension number lengths of 2 to 5 digits. DDI numbers take the form 0 + DDI code + extension (exactly 10 digits in total).
A copy of the Swiss dialplan is maintained by the Swiss regulatory council at http://www.bakom.ch
The Swiss dial plan is available for CUCM. The name is "CHNP".
Emergency Services
The following emergency numbers are used:
112: General emergency service (equivalent to 911)
117: Police
118: Fire Department
144: Ambulance
145: Toxicological Information
1414: Emergency air services (REGA)
0333333333: Emergency air services (REGA)
The European emergeny number 112 works too.
Important information regarding emergency calls when implementing VoIP can be found:
http://www.bakom.admin.ch/org/grundlagen/00563/00564/00658/index.html?lang=de#
The documents listed on this page explain how routing can be changed by using prefixes (Leitweglenkung).
Private/PBX Dialplan
"0" is generally used as a trunk access code.
The area code must be provided for all calls to subscribers (not to service numbers).
Voice Interfaces and signalling
Physical Interfaces ISDN is the most common access technology for business pstn access. Both BRI and PRI are available everywhere.
For ISDN BRI Interfaces, use "isdn switch-type basic-net3", for PRI Interfaces use "primary-net5"
Common ISDN BRI Int Config
(Should work for most sites):
interface BRI0/0/0
no ip address
isdn switch-type basic-net3
isdn point-to-point-setup
isdn incoming-voice voice
isdn reject vod
isdn static-tei 0
!-- DDI Interface. For MSN Interface leave it away.
Voice Port Config:
voice-port 0/0/0
translation-profile incoming TRANSLATION_IN
translation-profile outgoing TRANSLATION_OUT
compand-type a-law
ISDN Signalling
It's important to signal the proper ISDN plan/type. If this is not okay, the call may not come through and the numbers will not be shown correctly at the terminating phone (mobile).
Outgoing call
Mar 5 13:31:01.100: ISDN BR0/0/0 Q931: TX -> SETUP pd = 8 callref = 0x18
Bearer Capability i = 0x8090A3
Standard = CCITT
Transfer Capability = Speech
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0x81
Calling Party Number i = 0x0181, '3398'
Plan:ISDN, Type:Unknown
Called Party Number i = 0x81, '0566345xxx'
Plan:ISDN, Type:Unknown
Outgoing call (using special agreement, necessary if A-number needs to be transfered on call forward, recommended)
Sep 24 14:19:52.456 MEST: ISDN Se0/0:15 Q931: TX -> SETUP pd = 8 callref = 0x1212
Bearer Capability i = 0x8090A3
Standard = CCITT
Transfer Capability = Speech
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0xA9839F
Exclusive, Channel 31
Calling Party Number i = 0x2181, '264601xxx'
Plan:ISDN, Type:National
Called Party Number i = 0x81, '0719999xxx'
Plan:ISDN, Type:Unknown
Incoming calls from the ISDN provider will have the type "unknown"
Sep 24 14:22:07.231 MEST: ISDN Se0/0:15 Q931: RX <- SETUP pd = 8 callref = 0x00F8
Sending Complete
Bearer Capability i = 0x8090A3
Standard = CCITT
Transfer Capability = Speech
Transfer Mode = Circuit
Transfer Rate = 64 kbit/s
Channel ID i = 0xA9838D
Exclusive, Channel 13
Calling Party Number i = 0x0183, '0795556xxx'
Plan:ISDN, Type:Unknown
Called Party Number i = 0x81, '243'
Plan:ISDN, Type:Unknown
The following translations help to adjust the numbers:
PSTN incoming: add a "0" to the calling number of the PSTN user
voice translation-rule 1
rule 1 /^0/ /00/
PSTN incoming: adjust called number to company dialplan
voice translation-rule 2
rule 1 /^.*\(......\)/ /\1/
PSTN outgoing: adjust calling number
voice translation-rule 3
rule 1 /^0\([1-9]\)/ /\1/ type any national
rule 2 /^00\([1-9]\)/ /\1/ type any national
rule 3 /^000\([1-9]\)/ /\1/ type any international
voice translation-profile TRANSLATION_IN
translate calling 1
translate called 2
voice translation-profile TRANSLATION_OUT
translate calling 3
