factors behind migrating from cisco 1841 to cisco 2800

Hi there,
I have a Cisco 1841 in one of the co-location and it handles VOIP based traffic ... It's not a gateway router as is in a typical VOIP setup, instead that role is performed by a Quintum CMS ... and similarly, there is a Linux box on which the H.323 gateway process runs ... Now this 1841 has been suffering from lots of problems lately and requires a manual restart every 2 to 3 months, sometimes even 1 month ... the error messages that cause the issue are either low on memory (and in tht case, i cant telnet/console) into the box ... other times, the utilization is around 99% ... and we have to restart the router to get it back to normal ....
In the past, I've looked for any known debugs on Cisco website for the IOS (C1841-ADVIPSERVICESK9-M), Version 12.4(9)T7 but there were not any .. I changed the IOS to (C1841-ADVIPSERVICESK9-M), Version 12.4(9)T20 but still the same issue and router CPU utilization either goes to 90 % at times or just runs low on memory ....

While I check the show interfaces commands to check the number of incoming/outgoing packets on its outside (internet) interface and DMZ interface, they normally average around 700-1000 packets/sec  ... Sometimes even more ....

What I want to know is generally the factors that are considered (any statistical information I'll be happy to give with) to know if its time to migrate to a higher model (if yes, which 1), else if we should change the box, etc ? Will appreciate ur valuable feedback !
nabeel92Asked:
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Magim_ITCommented:

Hi,
 
Are you a non-profit organisation? If YES You may get special prices from Cisco
You can speak to Cisco and try split payment option
check out this link,
http://www.cisco.com/cisco/web/solutions/small_business/programs_promotions/index.html

If you have low budget then you can use low cost Cisco switches, here is the link
http://www.cisco.com/cisco/web/solutions/small_business/products/routers_switches/index.html

Do you really need 2821, how much WAN bandwidth do you have?
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Magim_ITCommented:

Sorry pls discard this answer, wrongly typed
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nabeel92Author Commented:
sure, no problem..
price is not the concern, looking for technical factors here .... if there is any statistical information i can provide for expert to answer, let me know !
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Magim_ITCommented:

How much bandwidth you have?

From my past experience and guidance from Cisco I follow this rule
1841 for less than 2MB
2811 for less than 4MB
2821 for less than 8MB
2851 for less than 16MB
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nabeel92Author Commented:
well, the bandwidth is only 2 mbps ... its all voip traffic based on G.729 protocol ... but its just a lot of traffic ... we're planning to upgrade the bandwidth as well but for now, it seems that when so much of this traffic is sent, it effects the router's processing  ..
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Magim_ITCommented:
Just enable ip-accounting and check who is generating triffic to where, maybe you can block the unwanted traffic by applying access-lists
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nabeel92Author Commented:
ok, we're purchasing teh 2800 anyway ... so all good now !
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