dspfarm profile x mtp - software vs hardware

[mmedwid]

On the 2811 ISR when you configure mtp (say for on hold or forwarding etc) you have the option

of configuring software of hardware mtp.  If you choose software does that mean a call on hold

would actually be media terminated at the UCM server?  Are DSPs used up if you select

software?  I believe no but want to confirm.  Any disadvantage to using software for MTPs?

nyc-2811-1(config)#dspfarm profile 3 mtp

nyc-2811-1(config-dspfarm-profile)#maximum sessions soft ?

  <1-10000>  Number of sessions assigned to this profile

nyc-2811-1(config-dspfarm-profile)#maximum sessions hard ?

  <1-7>  Number of sessions assigned to this profile

[nitsinha · Accepted solution]

If you use IOS based software MTP on the oruter, that means you are using  the router processor resource and not the CUCM resource.

• Software MTP—Software-only  implementation that does not use a DSP resource for endpoints using the  same codec and the same packetization time.So this would be a disadvantage of the software MTP since it cannot change the packetization period.
  

• Hardware  MTP—Hardware-only implementation that uses a DSP resource for endpoints  using the same G.711 codec but a different packetization time. The  repacketization requires a DSP resource so it cannot be done by software  only. Cisco Unified Communications Manager also uses the term software  MTP when referring to a hardware MTP.

Because a software-only MTP does not require DSP  resources, you can configure a software-only MTP without a voice network  module, or on the NM-HDV if you do not enable the dsp services dspfarm command for the voice card.

Hope that helps

Regards

Nitesh

PS:Pl rate helpful posts

[mmedwid]

Thank you!