Required SIP Trunk licences

[pasesanchez]

Hi Guys,

I have a CS1000 connected to an Asterisk box by a SIP Route with x trunks inside. The questions are:

1) How many (x) SIP trunk licenses I need to purchase in order to establish 10 simultaneous SIP calls between the CS1000 and the Asterisk box?

2) Is it needed one SIP trunk license per each call between the CS100 and the Asterisk box?

Thanks.-

 

[Reusser]

1 sip license per call if Call is just one-way.

If call goes back to switch at least one additional trunk will be used even if anti-tromboning is used. Though the trunk will be freed up after call completes back. If no anti-tromboning, you will need an additional trunk for as many calls that are expected to return to Nortel switch.

 

[pasesanchez]

So, let me see if I understood, for instance for a simple call, user A at Asterisk call user B at CS1000, we will have the INVITE from A to B, then 180 and 200 OK from B to A and finally the ACK from A to B. The described signaling will consume 2 SIP trunk license ?

Regards.-

 

[Reusser]

no - Signaling does not use VTRKs just the voice path.

So if User B on CS1000 calls user A on Asterisk - only 1 vtrk is used.
If however, User A transfers call back or CFNA back another VTRK is needed (in the case of anti-tromboning the resource (1 vtrk) must still be avaiable)