Showing posts from September, 2012

CME Media Resources - Conference Bridge

There are two types of conferences supported by CME
Ad-hoc Conferences
In ad-hoc conferences, the initiator will use Conf softkey to dial parties and join them into conference (there are other advanced methods to establish conference as well) . Ad-hoc conferences can be completed using software CFB or hardware CFB.
Software CFB
- Software CFB uses router CPU
- Software resources can provide a max of 3 participants (SIP, SCCP, or PSTN) with G711 codec only. For mixed codecs transcoder should be invoked. In case XCODER isn't available, conference can't be completed.
- The max number of software ad-hoc simultaneous conferences depends on CME platform.
- Each phone can be part of one conference at a time
For software CFB nothing needs to be configured since its enabled by default and can't be disabled. A workaround to disable it is to enable hardware CFB without configuring DSP resources.
To change some default configuration for software CFB:
Number of Conference…

CME Media Resources - Transcoding

CME support transcoding between G711 and G729 for the following features:
3-way Ad-Hoc software conferencingCall-Forward or Call-Transfer (one leg of a hairpin call is using G711 while the other is using G729).MoH (G711 MoH stream is transcoded to G729 phone)CUE (G729 calls forwarded to CUE which is using G711 only should be transcoded)
Restrictions Meet-me conferencing not supportedMultiple-party ad-hoc conferencing not supported
By default codec configuration on SCCP phones will be used for internal calls within CME. Also, it will always be used in best effort mode trying to achieve minimum bandwidth and DSPs utilization. For external calls crossing trunks, codec configuration won't be used at all. External codec will be used by SCCP phones. This has been changed by introducing dspfarm-assist keyword which will force codec configuration to be used in internal and external negotiations.
If the codec g729r8 dspfarm-assist command is configured for a S…

CME Additional Features - Part 2

CME allow the customization of softkeys displayed on SCCP or SIP phones in different call states. This is done using templates which are then assigned to phones. The next table will show phone states: Call State Available Softkeys Idle Redial, CFwdAll, DND, PickUp, GPickUp, Newcall, Login Seized Redial, CFwdAll, PickUp, GPickUp, EndCall Alerting Acct, EndCall, CallBack Connected Acct, Confrn, Hold, Trnsfr, Endcall, Flash, Park
*** Seized call state is the initial dial tone state after going off-hook to place an outbound call. Alerting is the state after the telephone number has been dialed and the user is waiting for the called number to answer.
You can block some softkey features using feature blocked command. The softkeys will still appear on phone display but they won't be functional. This is supported for SCCP phones ONLY.
For features that aren't listed under feature blocked command, you can remove the associated softkey from the template as a workaround to dis…