CUCM is connected to Carrier SBC via CUBE and have a question regards the MTP requirement.
The only requirement for MTP is to provide 'intercept message' by carrier when dial out a long distance call without '1' in front of 10 digit by mistaken. when I enabled MTP in CUCM SIP trunk interface, IP Phone can get proper intercept message from carrier as exmaple 'please add 1 in front of your dial destination' but 'air dead' if I disable MTP.
As I know its 'early media' feature and I found CUBE support the following,
voice service voip
Is the carrier 'intercept message' accomplished by 'early media' feature in CUBE? My goal is eliminate MTP requirement in CUCM side.
If you're using 'early-offer forced' I would upgrade to a 20T or 22T version first, as I don't believe it's officially supported until 20T (though the command exists)
Is this call flow SIP-SIP or H323-SIP?
You may want to check the restrictions to make sure the call flow you're wanting to do, as a number of the situations where you would want to use early-offer forced aren't supported call flows. Here's a link for SIP-H323:
We are doing delayed offer on leg 1 since this is an outgoing call and CUCM doesn't have MTP required checked. This means that we do not have media information on where to send audio for CUCM.
After we send the invite on leg 2, without media, we will receive a 18x message that is designed for ringtone. If the message does not have any media in it, we will normally generate ringback ourselves. If it does contain media, we will open our audio stream. Frequently when it has audio it is the provider sending audio that is similar to "Your call cannot be completed as dialed ...".
In this case, if we do leg 1 with delayed offer and leg 2 with early offer, you should be able to get the media from the provider since we will send media (SDP) in our invite.
I work for ATT and we've deployed the CUBE for our/ATT's BVoiP/Flex SIP offering. From what i've experieinced the early offer - delayed offer issue is different then the early media - delayed media issue. When using Cisco SCCP phones you are forced to the delayed offer path and most carriers only support early offer. So, the early offer forced command will fix the EO-DO issue, but it does not fix the EM/DM/PRACK/183 issue. We worked with TAC and we were forced to "require MTP" for all calls using our SIP-CUBEs trunk. Bad news for us, we're currently running CUCM 6.X where only G711 is supported in this scenerio. In CUCM 7.X you can specifiy either G711 or G729.
The short answer is that you don't.... That isn't entirely true while at
the same time it kind of is, but for the most part you don't configure
the softkeys. You enable or disable them via TCL. Here is the long
answer. Be sure to read the whole thing or e...
Topology: IP Phone > Switches > Microsoft NPS setup to forward 802.1x
proxy to > ISE 2.1 patch 3 Authentication: EAP-TLS using Cisco MIC SANs
Phone Models 802.1X support? 802.1x flavor Addtl Comment EAP-MD5 EAP-TLS
Cisco 3905 Y Y N Cisco 6911 Y Y N Cisco ...
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