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Con Configu iguring ring a PSTN PSTN dialpl dialplan an | CCI CCIE VOICE OICE-- Cisc Cisco o Tech ech Blog Blog
Written by Harshil | 04 May 2010 Posted in Voice - CCIE VOICE In this post we are going to describe a sample dialplan that could be used with PS TN simulator in your voice lab. Let’s start by looking at the following diagram to get basic understanding of the lab topology. In the diagram YY stands for two-digit rack number, for example example 01 and 02 for racks 1 and 2, and Y is the last digit of the rack number for example example 1 and 2 for racks 11 and 12.
There are three sites: HQ and BR1 are in the US and BR2 is in the UK. The PSTN router simulates a PSTN cloud with three ISDN connections. Note the dialing patterns on the diagram. The next thing to figure out is how various types of dialing patters are signaled to the PSTN are. In our case, the agreement is as follows: 1. Local area PSTN calls are placed to 7-digit numbers at the HQ and BR1 locations, and to 8-digit numbers at BR2 location. 2. Long-distance (national) calls at the HQ and BR1 are placed to 10-digit numbers using code “1” for toll-alert 3. Long-distance calls at BR2 are placed to 10 digit numbers at BR2 using code “0” for toll-alert. 4. International International calls at the HQ and BR1 sites are signaled using access code “ 011” along with the variable length number. 5. International International calls at BR2 are placed using toll-alert code “00” and variable length number. The above requirements provide quite a mix of different dialing patterns. What we are going to do, is configure dial-peers for full E.164 patterns corresponding to each site first, and then use translation rules to handle other types of dialing patterns, by expanding them to full E.164 numbers. Here is the configuration for E.164 numbers: ! ! Voice ports to BR1 ! voice-port 0/0/0:23 ! ! Voice port to BR2 ! voice-port 0/1/0:15 ! ! Voice port to HQ ! voice-port 0/3/0:23 ! ! Handle DID !
Configuring a PSTN dialplan | CCIE VOICE- Cisco Tech Blog
Note that every pattern is unique thanks to E.164 number structure (country-code, area-code etc). Note that the PS TN router forwards 10 digits to HQ and BR1 endpoints while o nly 8 digits are forwarded over BR2 connection. Next we need to design the translation rules to transform various types of dialing (local, long-distance, international) to E.164 patterns. For example, look at the translation rule for BR1 site. voice translation-rule 10 rule 1 /^1[2-9]..[2-9]....../ /\0/ rule 2 /^011\(.*\)/ /\1/ rule 3 /^[2-9]....../ /1312\0/
The first rule handles long-distance numbers 1-[2-9XX-[2-9]XXXXXX by simply leaving them unmodified. This maps every LD number directly to the respective E.164 pattern (HQ or BR1). Next, rule 2 handles international dialing (011 + variable string) by stripping the prefix “011” and sending the remaining E.164 number along. T he last rule handles local dialing ([2-9]XX-XXXX) (dialing within BR1 area by prepending the country and area code corresponding to this location). Now look at the complete set of translation rules – note that we apply the rules directly to the respective voice-ports. ! ! BR1 translation rule ! voice translation-rule 10 rule 1 /^1[2-9]..[2-9]....../ /\0/ rule 2 /^011\(.*\)/ /\1/ rule 3 /^[2-9]....../ /1312\0/ ! ! BR2 translation rule
Configuring a PSTN dialplan | CCIE VOICE- Cisco Tech Blog
Now the final part of the PST N router configuration – the PST N phone. First, look at the older post which demonstrates how a PST N router could be configured to simulate a PSTN phone using the RTP loopback feature: Using RTP Loopback for PSTN Call Testing However, most people prefer to register a softphone (or a hardware phone) with the PSTN router and use it to place test calls. Here is how you could do this easily. First, configure the router as CME system and allow ephones registration. Then, create ephone-dns corresponding to the patterns specified on the diagram demonstrated before. Finally, create a ephone and set its MAC-address to a value matching your setup. Note that thanks to the translation rules, you can always dial the PST N phone numbers using their “l ocal” (7 digits) or national (10 digits) variants. interface Loopback0 ip address 177. Y.254.254 255.255.255.255 ! ! CME configuration !
Configuring a PSTN dialplan | CCIE VOICE- Cisco Tech Blog
