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ASA 5510 - how many concurrent VOIP calls can pass through?

geghamwic
Beginner
Beginner

Hi all,

I wonder how many concurrent VOIP calls can handle Cisco ASA 5510, any idea?

Gegham

6 Replies 6

Karthik Sivaram
Enthusiast
Enthusiast

hi Gegham,

the Firewall throughput is up to 300 Mbps and the amount of Concurrent sessions that it can handle is 50,000 ; 130,000.

Here is a helpful link with the specs (see table 2 lists Platform Capabilities and Capacities of the Cisco ASA 5510)

http://www.cisco.com/en/US/products/ps6120/products_data_sheet0900aecd802930c5.html

Hope this helps!!

Thanks,

Karthik

Hi Karthik,

Thanks for reply. So conisdering that each voip call uses average 32kb, Cisco ASA 5510 can handle about 1000 concurrent calls, am I right?

Gegham

hi Gegham,

Can you tell me how you have arrived at the above calculation?

Thanks,

Karthik

sorry, not 1000 calls...if we consider 32kb each call, than ASA 5510 can handle about 3000 calls, agree?

hi Gegham,

Basically what the values of  50,000 and 130000  connections indicate  are lab values  tested with 80% TCP and 20% udp  traffic. (according to table a-2 in the doc below)

http://www.cisco.com/en/US/docs/security/asa/asa72/configuration/guide/specs.html#wp1170941

RTP  is udp traffic but in case of an asa and considering a customer  scenario what happens is...

1 voip call =  1 control connection (h323,sip,sccp)    +   2 or 4 rtp connections

-so a call will in total  easily consume  5  or more  connections depending on control connections you have set up .

-also this number differs depending on if the call is  voice only or video.

So to  simply answer your  questions...

1>the number of connections that a call  consumes depends on the above factors.

2>Also there is no hard number on the  number of calls an asa can handle because this depends on the controls  you use ...including nat and inspections.

Thanks,

Karthik

had the same issue. Thanks for the post

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