Call hold Process

Call hold Flowchart
call hold signaling:

1) User 1000 sends Re-invite message to IPBX, need to keep the call between 1000 and 1002. The Re-invite message carries the c=in IP4 0.0.0.0in the SDP, stating that the re-invite message is a call hold message.

INVITE Sip:[email protected]:5060sip/2.0

Via:sip/2.0/udp192.168.50.20:9588;branch=z9hg4bk-d8754z-da66ec3fc2251561-1---D8754z-;rport

Max-forwards:70

Contact:<sip:[email protected]:9588>

To: <sip:[email protected]>;tag=54267485a

From: "<sip:[email" protected]>;tag=8c7df95e

Call-id:zjbim2mxndq3zwnlm2jhyjawyweyngjlmwe4njzjymq.

Cseq:3 INVITE

Allow:invite, ACK, CANCEL, Options,bye, REFER, NOTIFY, MESSAGE, SUBSCRIBE, INFO

Content-type:application/sdp

Supported:replaces

User-agent:bria Professional release2.4 Stamp 49381

content-length:238

V=0

O=hua 9 3 in IP4 192.168.50.20

S=counterpath Bria Professional

C=in IP4 0.0.0.0

T=0 0

M=audio 7624 RTP/AVP 0 101

A=fmtp:101 0-15

A=rtpmap:101 telephone-event/8000

A=sendonly

A=x-rtp-session-id:84405823042846cfa4f793eb20feb7e6

2) Ipbx received Re-invite request a response to keep the user + and the 1002 between the calls, and to the user 1002 Play background music to the user + Reply Confirmation Message OK.

sip/2.0 OK

Via:sip/2.0/udp192.168.50.20:9588;branch=z9hg4bk-d8754z-da66ec3fc2251561-1---D8754z-;rport

From: "<sip:[email" protected]>;tag=8c7df95e

To:<sip:[email protected]>;tag=54267485a

Call-id:zjbim2mxndq3zwnlm2jhyjawyweyngjlmwe4njzjymq.

Cseq:3 INVITE

User-agent:freeswitch

Contact:<sip:[email protected]:5060>

Content-type:application/sdp

content-length:201

V=0

O=session 1639146064 1639146065 in IP4192.168.50.22

S=play

C=in IP4 192.168.50.22

T=0 0

M=audio 10476 RTP/AVP 0 101

a=rtpmap:0 pcmu/8000

A=rtpmap:101 telephone-event/8000

A=fmtp:101 0-16

3) User + received Ipbx Send acknowledgement Request message OK , send ACK Message to Ipbx

ACK Sip:[email protected]:5060 sip/2.0

Via:sip/2.0/udp192.168.50.20:9588;branch=z9hg4bk-d8754z-ef0e4b7cfe6a7548-1---D8754z-;rport

Max-forwards:70

Contact:<sip:[email protected]:9588>

To:<sip:[email protected]>;tag=54267485a

From: "<sip:[email" protected]>;tag=8c7df95e

Call-id:zjbim2mxndq3zwnlm2jhyjawyweyngjlmwe4njzjymq.

Cseq:3 ACK

User-agent:bria Professional release2.4 Stamp 49381

content-length:0

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Call hold Process