As seen before in the SRST post, you can define the mapping between your internal dial plan and the outside world . You can define it as in SRST by using the command dialplan-pattern. You can also as precise before use also the translations rules which are easier to manipulate your digits.
Here is as usual a basic configuration that you can perform to enable your CME router.
!
tftp-server flash:<<firmware>>
telephony-service
max-ephones <<X>>
max-dn <<Y>>
load <<phone_type>> <<firmware_load>>
ip source-address 10.1.2.1 port 2000
create cnf-files
transfer-system full-consult
!
ephone-dn <<tag-number>> <dual-line>
number 1234
name technical
!
ephone <<tag-phone>>
mac-address <<AAAA.BBBB.CCCC>>
type <<phone_type>>
button 1:<<tag-number>>
CME provides call processing and enterprises telephony features in a small-to-medium sized network environment, and supports an amount of IP Phones depending the router platform.
To deploy it , you must also install several additional files in the flash and be sure to have the clock set up (it can be done also via the NTP) as it is needed to generate the CNF-Files.
To match the local number with the external number during a SRST failover, you can use the command dialplan-pattern <<tag_pattern>> extension-length <<length>>. this command also ensures that a full E.164 address is sent as the ANI for outgoing calls. The dialplan-pattern command causes the SRST router to create an additional virtual dial peer for local extension corresponding to the pattern specified in the command.So, this command can be used to map the DNIS sent by the PSTN to a local extension.
Pay attention that if you play with translation rules on your voice-port, it may be a good choice also to continue with digit manipulation to conform your SRST dialplan as the translation rule are processed before.
As with Call Transfer , Call Forwarding is enabled by default between IP Phones which are registered with the SRST process.Again if you need to enable H450v3 call-forward for non-local numbers , you have to enhance your config with the following comand:
call-manager-fallback
call-forward <<pattern>>
!
Example of this will be :
call-forward pattern .T
SRST routers support also the call transfer between IP Phones by default when they are registered onto it. But to really have a successful transfer call , you need also to precise the pattern transfer and the way on how it will transfer your call. So don’t forget to implement these commands:
!
call-manager-fallback
transfer-pattern <<pattern>>
transfer-system <<method>>
!
What are representing the parameters ?
- <<pattern>> is the pattern that you authorize to dial under SRST mode ( example …. or .T)
- <<methods>> is the call transfer method operation.
Let’s see what are the operation mode possible:
- Blind : Cisco proprietary method where calls are directly transferred without any consultation.
- Full-blind : H450v2 standard for call transfer where calls are directly transferred without any consultation.
- Full-consult : H450v2 standard for call transfer where you need to perform a consultation before to initiate the real transfer. This method requires two line to make the transfer and if the second line is not available then the full-blind is used instead.
- Local-consult : H450v2 standard for call tranfert but this time, it is only valid for local transfers.So again if you don’t have the second line or you are not transferring to a local party , the blind method is used instead.
Full-blind and full-consult are the Cisco preferred method.
Don’t forget also to configure your line as dual-line to allow not only the call transfer but also the call waiting , conferencing and so on
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