266 V7122 GatewayUser GuideF5 10.8.201.108 ==> 10.8.201.10 ACKACK sip:1000@10.8.201.10;user=phone SIP/2.0Via: SIP/2.0/UDP 10.8.201.108;branch=z9hG4bKacZYpJWxZFrom: ;tag=1c5354To: ;tag=1c7345Call-ID: 534366556655skKw-8000--1000@10.8.201.108User-Agent: 3Com-Sip-Gateway/MP-108 FXS/v.4.20.299.410CSeq: 18153 ACKSupported: 100rel,emContent-Length: 0Phone ‘8000’ goes on-hook; gateway 10.8.201.108 sends BYE to gateway10.8.201.10. Voice path is established.F6 10.8.201.108 ==> 10.8.201.10 BYEBYE sip:1000@10.8.201.10;user=phone SIP/2.0Via: SIP/2.0/UDP 10.8.201.108;branch=z9hG4bKacRKCVBudFrom: ;tag=1c5354To: ;tag=1c7345Call-ID: 534366556655skKw-8000--1000@10.8.201.108User-Agent: 3Com-Sip-Gateway/MP-108 FXS/v.4.20.299.410CSeq: 18154 BYESupported: 100rel,emContent-Length: 0F7 10.2.37.10 ==> 10.2.37.20 200 OKF7 10.8.201.10 ==> 10.8.201.108 200 OKSIP/2.0 200 OKVia: SIP/2.0/UDP 10.8.201.108;branch=z9hG4bKacRKCVBudFrom: ;tag=1c5354To: ;tag=1c7345Call-ID: 534366556655skKw-8000--1000@10.8.201.108Server: 3Com-Sip-Gateway/TrunkPack 1610/v.4.20.299.412CSeq: 18154 BYESupported: 100rel,emContent-Length: 0SIP Authentication ExampleV7122 gateway supports basic and digest authentication types, according to SIP RFC 3261standard. A proxy server might require authentication before forwarding an INVITE message.A Registrar/Proxy server may also require authentication for client registration. A proxyreplies to an unauthenticated INVITE with a 407 Proxy Authorization Required response,containing a Proxy-Authenticate header with the form of the challenge. After sending an ACKfor the 407, the user agent can then resend the INVITE with a Proxy-Authorization headercontaining the credentials.User agent, Redirect or Registrar servers typically use 401 Unauthorized responses tochallenge authentication containing a WWW-Authenticate header, and expect the re-INVITEto contain an Authorization header.The following example describes the Digest Authentication procedure including computationof user agent credentials.The REGISTER request is sent to Registrar/Proxy server for registration, as follows:REGISTER sip:10.2.2.222 SIP/2.0
