[cisco-voip] Verizon SIP vs. PRI?

[Tony Edwards]

here is my limited understanding..

1) sip / cube trunk is certainly looks promising , however , when you build
a business case , make sure you add up any wan bw upgrade costs to
accommodate x number of concurrent g711 calls for example. with all overhead
, some telcos recommend 100k for a g711 call , so you got to budget 500k for
rtp streams straight away on the same wan pipe , where your data apps will
flow. so , the costs savings of not buying e1 or t1 trunk & not buying e1 or
t1 controller cards on the voice gw can easily disappear , if you do maths
for sip trunk wan bw upgrade.

2) secondly , I gather they still have some having issues , even though
theoretically , t.38 should work well on this trunk. so you got to talk with
telco closely with their own offerings. in a worst case scenario , you can
still run some vg based faxing or even direct pstn if you few fax machines
on a given site.

3) watch out issues with sip profiles , which are essentially like voice
translation rules on h323 gw, where you match & replace digits. depending
upon telco , you got to send your ani with the realm name , rather than
cube's ip address.

4) depending upon flow around or  flow through deployment , you need to
configure mtp at ccm.

5) also , some times i have seen issues where sip trunk in ccm pointing to
the loop int of cube. it got fixed when i changed to its wan interface at
one of my cube cut overs.

finally , my biggest concern is the number portability of pstn & isdn in to
sip platform , which i gather is still an issue with some of the telcos
around the world.

also do not forget to configure the wan qos on 5060 port for sip traffic
when you role out a cube on production network.

other than that , i reckon sip cube trunks are very valid alternative to $$
expensive pri trunks.

tony





On Wed, Feb 9, 2011 at 6:13 AM, Lisa Notarianni
<notariannil1 at scranton.edu>wrote:

> We currently utilize PRI trunks as fail over and backup.  They connect to
> our 6509's.
>
> Can anyone share their thoughts on SIP vs. PRI services.
>
> Thanks,
>
> Lisa
> --
>
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