Which SIP method can be used to transfer calls?

SIP REFER method
Blind call transfer is implemented using the SIP REFER method based on RFC 3515. A Blind transfer can be used if the phones connected in the network support the REFER method. Most phones publicize their capabilities in the ALLOW header which is commonly present in a SIP INVITE message.

What is redirect server in SIP?

From the SIP RFC: Redirect Server: A redirect server is a user agent server that generates 3xx responses to requests it receives, directing the client to contact an alternate set of URIs. By propagating URIs from the core of the network to its edges, redirection allows for considerable network scalability.

What is subscribe in SIP?

A user agent interested in event notification sends a SUBSCRIBE message to an SIP server. The SUBSCRIBE message establishes a dialog and is immediately followed by the server replying with 200 OK response. The server sends a NOTIFY request to the user every time the event to which the user subscribed changes.

Can a SIP call be transferred to another SIP phone?

If the recipient of a SIP call transfer is a SIP phone, the phone must have the capability to interpret either the Refer method or the Bye/Also method for the call transfer to work. If the recipient is a Cisco IOS gateway, there needs to be a matching dial peer for the Refer-To user.

How does SIP call transfer and call forwarding supplementary services work?

Release Link Trunking (RLT) functionality is also added with this feature. With RLT, SIP blind call transfers can now be triggered by channel-associated signaling (CAS) trunk signaling. Finally, the SIP Call Transfer and Call Forwarding Supplementary Services feature implements SIP support of call forwarding requests from a Cisco IOS gateway.

Can a SIP call be transferred to a PSTN?

Optionally enable call transfers to the PSTN via your Trunk. This is optional as you may not want to allow calls to be transferred to the PSTN given the associated billing implications of such a transfer. Place a call via your Elastic SIP Trunk; once established, initiate a call transfer from your phone.

Who are the end users in a SIP call flow?

In this call flow scenario, the two end users are User A and User B. User A and User B are both using Cisco SIP IP phones, which are connected via an IP network. 1. User A calls User B. 2. User B answers the call.

Which SIP method can be used to transfer calls? SIP REFER method Blind call transfer is implemented using the SIP REFER method based on RFC 3515. A Blind transfer can be used if the phones connected in the network support the REFER method. Most phones publicize their capabilities in the ALLOW header which is commonly…