one of my client site has 3 meeting room with SX20. SX20s are registered with CUCM.
if somebody calls email@example.com from internet it should reach SX20 that is internally registered with CUCM .
Im able to make outbound video call without any issue. But incoming call not working. I can see call reaching both EXP E and Exp C.
In this setup they dont have any internal DNS server. So EXP C is pointing to the same DNS of EXP E external DNS say 22.214.171.124. thats the problem now.
Is that the reason incoming call not working for it? is it a must EXP C should be pointed to DNS server? how can i do this set up without internal DNS server...
They want B2B setup ...
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All of your devices should have proper DNS server settings on them, whether they be internal DNS servers (dedicated, a windows domain controller, a router, etc) or an external one (such as the 126.96.36.199 google server), but this is only used to resolve domain names to IP addresses (usually for outbound call routing).
For your troubleshooting, I'd suggest you go back through the Deployment Guide and check that against your installation and see if you can find the steps that were missed (which are quite likely to the the DNS SRV records in the Internet wherever your domain name is hosted).
If both your end, and theirs, both are using Expressways, you could create a qucik and nasty B2B connection using a Neighbour Zone without the need for DNS SRV entries, and just use the Search Rules to route calls between the two.
Where these Sx20s are registered?
If the calls are reaching to expressway C then i think you need to make proper search rules to route the calls to endpoints.
DNS will not come in picture until you will not routing calls to DNS zone or using any SRV.
And for that i think your Expressway E will play a role.
Suppose you are dialing firstname.lastname@example.org from outside then to reach your expressway E you need SRV _sip or _h323 and A record for your Expressway E.
Once the call reaches to your expressway E it will use some search rule and then route the call to Expressway-C
Now on Expressway C you just need a proper search rule to route the call to endpoint DNS not needed there.
Your B2B calls will work properly without any issues.
But yes as per deployment guides you need to have proper DNS configured on both to avoid any issues.
Please rate if it is helpful....
So in search history you are seeing that call is routed to CUCM successfully?
If yes then you need to check what pattern its sending to CUCM and whether that is there in CUCM or not.
So suppose from outside you dialed email@example.com and call reaches to Exp-C and on CUCM you have directory numbers with 1xxx only then you need to make a search rule on Exp-C which matches the (.*)@abc.com and replaces it to (\1) and then the target neighbor zone to CUCM.
So it should match with CUCM directory numbers and call will work.
Please rate if it is helpful..