You can use the Variable length on-net dialplan with partitioned-addressing. DNs in each site are in site specific paritions. There is a set of global translation patterns in the global partition for the inter-site calls to happen. The DN's CSS should have access to the site partition and the global partitions. If site A phone calls site B phone, it needs to dial the full E.164 number of site B phone, say 91408.2000. This will hit one of the translation patterns that gets rid of predot digits and sends the call to the site B phone via its hidden CSS.
By anyway thanks alote for your reply and help, but I still need more info . reference to my first conversation , I almost understand the concept THEORETICALY but can not understand how to designe the solution or impelement. First of all what do you mean by (Variable length on-net ...).
Reference to your answer :
There are 3 partitions, let Called
"SiteAp"(contain DNs in site A)
"SiteBp" (Contain DNs in Site B)
"Globalp"(contain 2 translation patterns for the inter-site calls for ex. : ext. 2000 in SiteAp call #91408.2000 to reach ext. 2000 in SiteBp and #91409.2000 for the opposit way )
and 2 CSS :
"SiteAcss" (Contain SiteAp and Globalp partitions)
"SiteBcss" (Contain SiteBp and Globalp partitions)
Is it right till now ? .If yes , it's great but I don't understand what did you say "sends the call to the site B phone via its hidden CSS". what do you mean by hidden css? , and finaly if these are all the config what I need so how does the mechanism or the flowchart of dialing the last example work ?
There is no IPT SRND dial plan chapter in the URL you gave me.
I hope to find a reply as soon as possible because I'm about to enter the live implementation phase
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