[cisco-voip] CUBE SIP to H323 query

[Max Pierson]

If you're doing ANY type of transcoding from one codec to another (ex. G711
to G729), or conferencing, or really any type of mixing of RTP streams, you
will need DSP's. The 2821 should have came with some DSP's if you purchased
a Voice feature set. Even if you use T1 PRI and no trunking to anything
else, you still need DSP's. Do a "show inventory" to see what your kit
currently has installed. If SIP calls are delivered via G729 and your
handsets support it (which almost all Cisco handsets do support it), then
simple calls from a SIP provider shouldn't have to be transcoded since it's
codec is something the phones understand natively. It really depends on what
all this gateway serves as.

M

On Mon, Jan 17, 2011 at 12:54 AM, Cisco Voip <cisco_newbie at yahoo.com> wrote:

> Hi all experts.
>
> My scenario is simple. I will be using CUCM v8 and connecting it to 2821
> (running CME or higher) over H.323. SIP trunk will be terminated on this
> 2821 router via local ITSP.
>
> After researching alot on cisco, kindly guide me that do i need DSP
> resources for translating between SIP and H.323 ? My findings were. If i
> want to support supplementary services then yes i need DSP. For basic calls,
> i dont need them.
>
> I am a bit newbie to cisco voip, pls guide me
>
> Note: I know already that instead of H.323 i can use SIP which is more
> prefered. But still to clear my concept, guide me with respect to H.323
> trunk between cucm and cube.
>
>
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>
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