A single IP500 V2 control unit can support up to:

• 204 Analog trunks total

• 8 E1/PRI digital trunks with 240 channels total

• 8 T1/PRI digital trunks with 192 channels total

• 16 BRI digital trunks with 32 channels total

• 125 SIP trunks with 128 concurrent calls total

• 32 H323/SCN trunks with 250 concurrent calls per trunk

This is a theoretical maximum possible trunk channels that can be supported, but other factors will reduce what can be utilised on a concurrent basis:

• Available licenses

• Trunk configuration

• VCM channels

• Maximum server call capacity

Analog and digital trunk capacity is dependent upon the hardware fitted to the system unit. The following table shows the various constructs and the resulting maximum (note that many variants are not shown):

Trunk Card #1	Trunk Card #2	Trunk Card #3	Trunk Card #4	Exp. Module #1-8	Exp. Module #9-12	Max BRI	Max PRI E1/T1	Max Analog
Dual PRI	Dual PRI	Dual PRI	Dual PRI	ATM 16	-	0	240/192	128
ATM 4	ATM 4	ATM 4	4 Port Exp.	ATM 16	ATM 16	0	0	204
BRI 8	BRI 8	BRI 8	BRI 8	ATM 16	-	32	0	128
-	-	-	-	-	-	0	0	0

Server Type	Maximum Registered SIP Trunks	Total SIP Trunk Calls (direct/ indirect media)	Maximum IP Office (SCN) Trunks	Maximum Calls per SCN Trunk
IP500 V2	125	128/120	32	250

1. The Total SIP Trunk Calls figure is effectively the maximum number of concurrent SIP trunk calls/sessions. They can be distributed over one or more trunks on the same system.

2. SIP trunk concurrent call capacity is also limited by available licenses and the SIP Line > SIP URI > Max Calls per Channel setting.

3. The number of SIP Trunk session licenses requested by each system is defined by the Maximum SIP Sessions setting on the License > Remote Server > Reserved Licenses tab of IP Office Server Edition Manager. One available SIP Trunk session license enables one concurrent SIP session/call.

4. The maximum number of configured URIs per SIP trunk is 150. This is not correlated with maximum SIP trunks or concurrent calls.

5. The Maximum Calls per SCN Trunk figure is the maximum number of concurrent sessions supported on a single inter-node link whether WebSocket or Proprietary type. Note that the number of SCN channels is controlled by the Number of Channels setting on the IP Office Line > Line tab of IP Office Server Edition Manager.

6. H323 trunks are distinct from SCN, but are taken from the same capacity pool.

7. The PRI trunk capacity is also limited by available licenses. One available PRI Trunk Channel license enables one concurrent PRI call.