VCM operation 3

[3Sixty]

Can some confirm that the VCM is required for setup of calls on the IP office 500. The reason I ask this is because I was told it was required for call setup on IP phones. But I thought it converted the IP data to a format that was understood by legacy devise ie anything that is not IP. I have confirmed this by removing the VCM module and called IP to IP and it has created the call setup and conversation takes place. The same scenario but a call to a digital handset without a VCM module the phone ring (call setup) but no speech between IP and digital as I would expect.

Can anyone shed some light on this. I have alot of experience with VOIP on other manufactures but not on the Avaya product range.

Thanks,

Marshall

 

[Westi]

IP sets NEED the VCM channel for calls to digital phones and lines and to initially contact other IP phones then it drops the VCM channel and goes direct media. You can call but not talk if you don't have a VCM channel

Joe W.

FHandw., ACA, ACS

If you can't be good, be good at it!

 

[tlpeter]

See the ipoffice as one part TDM and the other part IP
The TDM and IP part can only talk with eachoter by a vcm card
Ip to ip does not need a vcm
Tdm to tdm also does need it
tdm to ip does need it

trunks are seen as tdm except for iptrunks (if the codec does match)
If the codec does not match it needs a vcm channel

voicemail is also seen as tdm even pc base voicemail !!!


ACA - Implement IP Office
ACS - Implement IP Office
ACA - Voice Services Management
______________
Women and cats can do as they please and men and dogs should relax and get used to the idea!

 

[intrigrant]

A Voip environment needs the following components:
Gatekeeper
Mediaserver
Gateway

The GateKeeper is used for call setup and port allocation
The Mediaserver is used for converting and compressing TDM media to IP media and vice versa
The Gateway is the connection from IP to TDM and vice versa

The GateKeeper is part of the IP Office core software.
VCM channels are only used for calls from IP to TDM, from TDM to IP and from IP to IP if the compression is different.

So yes, without a VCM card you can call from IP Phone to IP Phone with audio if "Direct Mediapath" is enabled. You may not have dial tone or busy tone on the IP Sets.
A call from IP to TDM has no audio, a call from a IP or TDM Phone via a IP Trunk will fail as IP Trunks always use VCM Channels.

 

[3Sixty]

Thanks that has cleared up what I thought. I have a system with 8 channels of PRI and 22 IP phones and 10 Dect handsets. The Avaya distributor was telling me I would need a more than 8 VCM channels but I was happy with 8 VCM channels. I have had this argument a few times with various people and I have explaned how I have made IP calls without the VCM module being installed in the IP500 system.

Thanks again

Marshall

 

[Belrick]

Probably ad this arguement with old school techs as prior to 3.2 a VCM channel was required to setup the call.

 

[Westi]

now I have it in writing "I am old", LOL

Joe W.

FHandw., ACA, ACS

If you can't be good, be good at it!

 

[3Sixty]

Thanks everyone that clears up why some say that it is required and some say it is not required. I have not worked on the Avaya product since it was the Lucent Alchemy and I am happy to say the reliabilty has improved and the enhancements are second to none.

Thanks for all the replys

Marshall

 

[TomMills]

reliability improved?

i think you are in the wrong forum ha ha