FOOD FOR THOUGHT pjsip connecting 2 servers - choosing the prefix digit

[ostridge]

Following the interconnecting incredible as Interconnecting_Incredible_PBX_Servers_with_PJsip_
Using the either to other outbound routes it struck me that 9 is NOT a good prefix if you happen to also have an outbound Emergency route to 999 as

Hmm: I'm thinking 8 is a better option.
And as an afterthought: It may be worth considering restriction on the extensions that can use that route so here is my 2pence:

(   )  8  | [ xxx   /  7XX ]

The 7XX is in the CallerID field So that only 7 something extensions can use it.

 

[kenn10]

If they are small systems, why use a prefix digit at all? Just have a different range of extensions on each system like 701-720 on one and 721-740 on the other and set up the outbound route on each end appropriately.

 

[islandtech]

I have nine systems using IAX2 trunks that use extension ranges for routing.
Many of my systems are old and cannot run pjsip, to me IAX2 is easier to configure.