How to configure the display of the sip trunk name on phone displays?

Question

Asterisk

There are almost 2 dozen trunks from zadarma to different cities, there are pieces of iron - grandstream 6102, cisco 303 and siemens 530 ip phones. The main task is this - when calling to any of the trunks, the phone display should display the name of the trunk to which the call is being made - to Moscow means MSK and of course the caller's number itself, this is necessary so that the manager knows which city is being discussed without asking the client a question , simply identifying visually by code is not an option. Judging by the ip PBX documentation, this function is there, and there is also an understanding of what is possible on phones. Perhaps you have already experienced something similar?

Answer 1

When making an outgoing call, you need to use the CONNECTEDLINE function with the name parameter. This function will send an update to the caller with the new name of the connected party. So you can specify a prefix to the name or upload data about the dialed number from the CRM system. But there is a but:
1) Such an update must be supported by the phone (cisco / linksys support)
2) The sip.conf parameter must be specified for the phone sendrpid=pai (values ​​\u200b\u200bare possible, depending on the phone model)

Answer 2

The bottom line is that you need to direct the incoming of each trunk to a separate context.
Extensions in a context should start like this:

[from-msk]
exten => s,1,Set(CALLERID(name)=MSK)
same => n,Goto(incoming,${EXTEN},1)

In theory, the caller's number should remain intact.
And you already wrote the answer to the same question of yours
How to transfer the displayed sip id to the cisco spa303g2 phone screen?

Answer 3

Can be selected from the channel name. It is named after the trunk. CHANNEL variable