3300 Compression

[bearvalley]

Im really confused with regards to compression.
Do you need licences for compression on IP Trunking?
Do you need licences for handset compression zones?

You seem to be able to turn these on even if no licences are purchased?

Thanks

 

[slapin]

You need compression licenses for traffic which crosses TDM/IP (E2T) boundary. In order to use it you also have to have DSP resources (QuadDSP cards or T1/E1 modules). You can turn compression over IP trunks and it will work for calls between IP phones without any licenses. If call comes from PSTN and ICP routes it to IP trunk compression will not work. E2T compression affects all TDM trunks including analog LS/ONS lines and digital T1/E1 and Voicemail.

 

[Mitelpassion]

simply put, a call from an ip phone to another ip phone in different compression zones are compressed. you can do same zone compression.

ANY call from any extension IP or digital/analogue that go to TDM will need and use a compression license if available if the extensions are in a different compression zone than zone 1.

someone correct me if I'm wrong but this is they way I understand it.

 

[slapin]

You do not need a compression license if call comes from LS/GS or PRI and goes to ONS phone. Only when it crosses TDM/IP bridge. If you put two phones to different compression zones they will use compression but you don't need a separate license. Each phone already comes with prepaid licence for G.729 codec (patent fee). Two IP phones homed to two different ICPs connected over IP trunk with compression on don't need a license. (Voice stream doesn't touch ICPs and goes directly from one phone to another). You can even turn one intrazone compression. In this case phones will use compression even if coneected to the same ethernet LAN and you still don't need a separate licence.
Actually on-line help gives very clear description of this features. Make a little drawing for better understanding (I did...)

 

[bearvalley]

Cheers for all your help guys. It all makes perfect sense now

Thanks Again