[cisco-voip] Does anyone know the features sip phones do that have that SCCP phones can do?

[Wes Sisk]

Hi Greg,

One bite at a time. Inline, ws.

Gregory Wenzel wrote:
> I have a client with approx 1000 phones and is about to do an office 
> job on this legacy system. He is stuck on sip, why I have no clue
ws: yep, hear this frequently. "We want SIP!"
> but most likely he wants to use cucm8.5 with cheap sip phones
ws: 3rd party SIP phones will have to provisioned by whatever means they 
offer.  With Cisco phones doing SIP we use vendor extensions so that SIP 
phone user experience is nearly seemless compared to SCCP phone user 
experience.  It is not yet possible to do all of the features in fully 
"standardized" (not really a standard) SIP.  For a start toward the 
details try the SIP line side messaging guide:
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/sip_msg/line_std/8_0_1/siplst801.pdf
> besides his service provider telling him he should go all sip and run 
> g729 on-net is not such a great advice, that will only save him in the 
> shortrun with purchasing dsp modules. They have no bandwidth issue 
> haveing a comcast tls 100mb link betw the two sites and a few satelite 
> offices in the philly area. Not ever having built a purely sip system. 
> They have 3 pri's now and I dont see them needing to run g729 onnet 
> and  loose that sound quality.
>  
> What does it mean when you have to build the dial plan?
ws: SIP endpoints each need local instruction on what to do with 
digits.  With Cisco CM and Cisco SIP phones phones default to 'send 
everything to the server' so the server still performs central routing.  
You can get creative with routing at the endpoints similar to host based 
routing if you have an IP background. Normal conditions apply, just 
because you can doesn't mean you should.
> and a sip profife for each phone?
ws: yep, pretty much every phone gets a profile.  look for good bulk 
provisioning in the phones.
> im embarassed to even ask that but wanted some clairfication from 
> anyone on the group for the dial plan question and besides video 
> advantage not working yet with sip phones what are the other features 
> that do not work yet?
ws: Now it feels like we've jumped back to Cisco CM + Cisco phones.  The 
last SIP/SCCP comparison I saw was here:

Note, if you deploy Cisco CM + Cisco phones the SIP experience can be 
very similar to SCCP experience for both user and administrator.  
However, this is only by vendor extension.  Cisco CM with "basic sip 
device" offers very basic features.  That said feature support varies 
even within Cisco phone models.  Check the Administration Guide for each 
model phone (or get your account team to compile?) to verify details. 
Example:
http://www.cisco.com/en/US/customer/docs/voice_ip_comm/cuipph/7975G_7971g-ge_7970g_7965g_7945g/8_0/english/administration/guide/7970dif.html

/Wes
>  
> even a  link to the answer would help or a kick in the butt right 
> direction would be great
>  
>  
> Regards,
>  
> Greg
> ------------------------------------------------------------------------
>
> _______________________________________________
> cisco-voip mailing list
> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>   
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://puck.nether.net/pipermail/cisco-voip/attachments/20100831/97a2e902/attachment.html>