How to know the max concurrent calls

Asterisk Asterisk Support
1

Hello All,
I am runnning Asterisk 1.8.9 + FreePBX 2.9 and it had 16 PSTN lines and 4 E1.

how to know the max concurrent calls that my server can support for each trunk PSTN line and each E1?

these are my server spec:

  • Processor 2x Quad core Xeon Westmere 4C E5620 (2,4 Ghz) 12M 5.86 GT 80W ( support dual processor )
  • Chipset Intel 5520 with QPI up to 6.4GT/s
  • Memory 6 x 8 GB DDR3-1333 ECC REG (Max 192 GB/12 DIMMs)
  • HDD 2 x 500 GB SATA 3,5” Hot Swap ( Max 8 )
  • HDD 2 x 2TB Enterprise SATA 3,5” Hot Swap ( Max 8 )
  • Expansion slots : 1 PCI- E 2.0 x16 + 1 PCI-E 2.0 x8, 3 PCI – E 2.0 x8
  • Intel ICH10R for 6 SATA, RAID 0,1,5,10 (Windows ), RAID 0,1,10 (Linux )
  • Onboard LAN : Dual LAN with Intel 82576 Gigabit Ethernet
  • Redundant Power Supply 720w
  • Chasing 2U Rackmount
2

google “sipp”

3

He has mentioned ISDN. He hasn’t mentioned SIP.

Generally people are very reluctant to provide sizing information for Asterisk, other than to say what works for them

In any case, there isn’t enough information here to be at all accurate. If most of the calls are handled by native bridging, the CPU load could be much lower than if the application requires a lot of work on the host processor.

The telephony hardware is likely to make a big difference, especially if echo-cancellation is needed.

I don’t understand the difference between PSTN and ISDN in this context. If PSTN means analogue, the maximum capacity of a single circuit is 1 erlang!

4

Hi, Thanks PSTN is analogue, so the max. concurrent should be 1
how about for E1?

I need advise

thanks

5

16 calls (1 per analogue channel)
EuroISDN on an E1 is 30 voice channels + 1 data channel + 1 sync channel, so 30 calls per E1.

16 + (4 * 30) = 136 calls.

6

so,

1 E1 has 30 voice channels (ie. channel 1 - 30), max concurrent call for each channel is: 16 calls…
so if I group the trunk into g0 … then max. concurrent call for g0 should be 30x16 = 480

sip.conf
call-limit=480

am I correct? …

please advise

thanks

7

No. An E1 is 30 channels. Each channel is 1 call. Therefore an E1 is 30 calls.

8

so, it’s same with analogue PSTN line…
I should put:

sip.conf
call-limit=30

for E1 trunk group?

9

Well, you can, but it is redundant. If you have 30 calls going and try to place any additional calls, either the call will fail because of the call limit setting or because the E1 driver cannot allocate additional channels in the E1 trunk group.

10

hmmm, it’s redudant?
so do I need to set call-limit actually? …

11

Information set in sip.conf has no effect on ISDN and analogue channels.

12 
run in shell 
asterisk -rx 'show channels' | grep 'active channels' | awk 'END{print $1}'

[quote=“Winanjaya”]Hello All,
I am runnning Asterisk 1.8.9 + FreePBX 2.9 and it had 16 PSTN lines and 4 E1.

how to know the max concurrent calls that my server can support for each trunk PSTN line and each E1?

these are my server spec:

  • Processor 2x Quad core Xeon Westmere 4C E5620 (2,4 Ghz) 12M 5.86 GT 80W ( support dual processor )
  • Chipset Intel 5520 with QPI up to 6.4GT/s
  • Memory 6 x 8 GB DDR3-1333 ECC REG (Max 192 GB/12 DIMMs)
  • HDD 2 x 500 GB SATA 3,5” Hot Swap ( Max 8 )
  • HDD 2 x 2TB Enterprise SATA 3,5” Hot Swap ( Max 8 )
  • Expansion slots : 1 PCI- E 2.0 x16 + 1 PCI-E 2.0 x8, 3 PCI – E 2.0 x8
  • Intel ICH10R for 6 SATA, RAID 0,1,5,10 (Windows ), RAID 0,1,10 (Linux )
  • Onboard LAN : Dual LAN with Intel 82576 Gigabit Ethernet
  • Redundant Power Supply 720w
  • Chasing 2U Rackmount[/quote]