Updates to SIP messaging for BYOC-Premises

As part of the unification and automation framework, Zoom will be making some changes to the SIP messaging from Zoom to customer SBC. The changes are outlined below:

Ensuring that any Bring Your Own PBX (BYOP this is a functionality that allows to call from a Zoom extension to a PBX extension and vice versa) calls from Zoom to Customer SBC will only send the actual dialed extension and will NOT send the country prefix of +1
Aligning the SIP messaging that will be sent from Zoom to your Session Border Controllers (SBC).

Note: Values like Source IPs, Destination IPs, Calling Numbers, Called Numbers, and others provided here are for informational purposes only and may vary from an actual call to your SBC.

You can review some standard formats of the SIP messaging below that you will see after the changes:

INVITE from Zoom to Customer SBC

INVITE sip:+4423452345@1.1.1.1:5061 SIP/2.0

Via: SIP/2.0/TLS 2.2.2.2:5061;branch=z9hG4bK0cBa6f6882f1c2257cc

From: "Jane Doe" <sip:+3356785678@1.1.1.1>;tag=gK0c190532

To: <sip:+4423452345@1.1.1.1>

Call-ID: 220988637_100568287@2.2.2.2

CSeq: 422074 INVITE

Max-Forwards: 70

Allow: INVITE,ACK,CANCEL,BYE,REGISTER,REFER,INFO,SUBSCRIBE,NOTIFY,UPDATE,OPTIONS,MESSAGE,PUBLISH

Accept: application/sdp, application/isup, application/dtmf, application/dtmf-relay, multipart/mixed

Contact: "Jane Doe" <sip:+3356785678@2.2.2.2:5061;transport=tls>

Allow-Events: talk, hold, conference, vq-rtcpxr, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer

Privacy: none

X-Trace-ID: 7299729907299729944

P-Asserted-Identity: "Jane Doe" <sip:+3356785678@2.2.2.2:5061>

Supported: timer,replaces

Session-Expires: 1800

Min-SE: 90

Content-Length: 820

Content-Disposition: session; handling=required

Content-Type: application/sdp

v=0

o=Sonus_UAC 282321 56390 IN IP4 2.2.2.2

s=SIP Media Capabilities

c=IN IP4 3.3.3.3

t=0 0

m=audio 34168 RTP/SAVP 102 9 0 8 18 101

a=ptime:20

a=crypto:1 AEAD_AES_256_GCM inline:xxxxxxxxxxxxxxxx

a=crypto:2 AES_256_CM_HMAC_SHA1_80 inline:xxxxxxxxx

a=crypto:3 AES_CM_128_HMAC_SHA1_80 inline:xxxxxxxxxxx

a=crypto:4 AES_CM_128_HMAC_SHA1_32 inline:xxxxxxxxxxxx

a=rtpmap:102 opus/48000/2

a=fmtp:102 useinbandfec=1;maxaveragebitrate=40000;maxplaybackrate=24000;ptime=20

a=rtpmap:9 G722/8000

a=rtpmap:0 PCMU/8000

a=rtpmap:8 PCMA/8000

a=rtpmap:18 G729/8000

a=fmtp:18 annexb=no

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=sendrecv

100 TRYING from Zoom to Customer SBC

SIP/2.0 100 Trying

Via: SIP/2.0/TLS 1.1.1.1:5061;alias;branch=z9hG4bKac70570318

From: <sip:+4423452345@1.1.1.1>;tag=1c1498737852

To: <sip:+3356785678@2.2.2.2>;tag=gK0c99ab3f

Call-ID: 4502639049112023155659@1.1.1.1

INVITE

Timestamp: 1699570620

Content-Length: 0

180 Ringing from Zoom to Customer SBC

SIP/2.0 180 Ringing

Via: SIP/2.0/TLS 1.1.1.1:5061;alias;branch=z9hG4bKac70570318

From: <sip:+4423452345@1.1.1.1>;tag=1c1498737852

To: <sip:+3356785678@2.2.2.2>;tag=gK0c99ab3f

Call-ID: 4502639049112023155659@1.1.1.1

INVITE

Contact: <sip:+3356785678@2.2.2.2:5061;transport=tls>

Allow: INVITE,ACK,CANCEL,BYE,REGISTER,REFER,INFO,SUBSCRIBE,NOTIFY,UPDATE,OPTIONS,MESSAGE,PUBLISH

X-Trace-ID: 7299600230258954475

Allow-Events: talk, hold, conference, vq-rtcpxr, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer

Content-Length: 0

200OK from Zoom to Customer SBC

SIP/2.0 200 OK

Via: SIP/2.0/TLS 2.2.2.2:5061;alias;branch=z9hG4bKac70570318

From: <sip:+4423452345@2.2.2.2>;tag=1c1498737852

To: <sip:++3356785678@1.1.1.1>;tag=gK0c99ab3f

Call-ID: 4502639049112023155659@2.2.2.2

INVITE

Accept: application/sdp, application/isup, application/dtmf, application/dtmf-relay, multipart/mixed

Contact: <sip:+4423452345@1.1.1.1:5061;transport=tls>

Allow: INVITE,ACK,CANCEL,BYE,REGISTER,REFER,INFO,SUBSCRIBE,NOTIFY,UPDATE,OPTIONS,MESSAGE,PUBLISH

Allow-Events: talk, hold, conference, vq-rtcpxr, presence, as-feature-event, dialog, line-seize, call-info, sla, include-session-description, presence.winfo, message-summary, refer

X-Trace-ID: 7299729907299729944

Require: timer

Supported: timer,replaces

Session-Expires: 1800;refresher=uac

Content-Length: 347

Content-Disposition: session; handling=required

Content-Type: application/sdp

v=0

o=Sonus_UAC 61679 936490 IN IP4 1.1.1.1

s=SIP Media Capabilities

c=IN IP4 3.3.3.3

t=0 0

m=audio 34190 RTP/SAVP 0 101

a=ptime:20

a=crypto:3 AES_256_CM_HMAC_SHA1_80 inline:XXXXXXXXX

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=sendrecv

ACK from Zoom to Customer SBC

ACK sip:+4423452345@1.1.1.1:5061;transport=tls SIP/2.0

Via: SIP/2.0/TLS 2.2.2.2:5061;branch=z9hG4bK0cBa6f74cf01c2257cc

From: "Jane Doe" <sip:+3356785678@1.1.1.1>;tag=gK0c190532

To: <sip:+4423452345@1.1.1.1>;tag=2466E31E-CAF

Call-ID: 220988637_100568287@2.2.2.2

CSeq: 422074 ACK

Max-Forwards: 70

Content-Length: 0

BYE from Zoom to Customer SBC

BYE sip:+4423452345@1.1.1.1:5061;transport=tls SIP/2.0

Via: SIP/2.0/TLS 2.2.2.2:5061;branch=z9hG4bK0cBa6f8dc771c2257cc

From: "Jane Doe" <sip:+3356785678@1.1.1.1>;tag=gK0c190532

To: <sip:+4423452345@1.1.1.1>;tag=2466E31E-CAF

Call-ID: 220988637_100568287@2.2.2.2

CSeq: 422075 BYE