Upgrade from 6.4 to 7.2 Changes the RingBack Tone on Oracle AP Session Border Controller

Asset ID:	1-72-2027120.1
Update Date:	2017-05-12
Keywords:

Solution Type Problem Resolution Sure

Solution 2027120.1 : Upgrade from 6.4 to 7.2 Changes the RingBack Tone on Oracle AP Session Border Controller

Applies to:

Acme Packet 6300 - Version S-Cz7.2.0 to S-Cz7.2.0 [Release S-Cz7.0]
Information in this document applies to any platform.

Symptoms

The problem happens only on the version SCZ7.2.0 MR-4 GA, the ring back tone heard is different than the standard ring back tone heard on international calls.

The traces shows that the invite coming from Access side has a P-Early media supported Header while when the INVITE goes out to the core side there is no P-Early media Header.

Due to this the ring back tone coming from far end is not correct as it gets distorted.

Changes

Upgrade from 6.4 to SCZ7.2.0 MR-4 GA

Cause

Version S-CZ7.2.0 provides support for the SIP P-Early-Media that can be used in SIP INVITES, PRACKS, and UPDATES to request and authorize the use of early media. It offers an alternative to policy-based early media support.

Use the p-early-media-header parameter to enable P-Early-Media SIP header support. This parameter is disabled by default.
• none—(the default value) disables support
• add—enables support and allows the Oracle Communications Session Border Controller to add the P-Early-Media header to SIP messages.
• modify—enables support and allows the Oracle Communications Session Border Controller to modify or strip the P-Early-Media header in SIP messages.

In the current configuration it was disabled on the core side.

Solution

There are 2 possible solutions to this issue, described below.

1) Add an entry of HMR like this below and the P-Early media will be removed completely from the call

sip-manipulation
name delP-Early-Media
description
split-headers
join-headers
header-rule
name delPEarlyMediaInviteHR
header-name P-Early-Media
action delete
comparison-type case-sensitive
msg-type reply
methods
match-value
new-value

2) Modify the P-Early media Header in the SIP interface. (In this approach, no HMR is required.)

p-early-media-header modify
p-early-media-direction

# P-Early-Media: sendrecv, supported out on core
183 contains P-Early-Media: supported on core side and access side
180 contains P-Early-Media: sendonly on core side and access side
Correct Ringback is Heard

Extract from debug log:

Jul 1 19:50:03.213 [SIP] (2) INVITE 1 B<C-Initial> add_p_early_media_header: support for P-Early-Media header
Jul 1 19:50:03.213 [SESSION] (2) INVITE 1 out-req: get_session 0x4d18ea00(13) from request
Jul 1 19:50:03.213 [SIP] (2) INVITE 1 check_trust(all) trusted 10.7.36.4:5090
Jul 1 19:50:03.213 [SIP] (2) INVITE 1 B<C-Initial> add_p_early_media_header: Msg is from a trusted endpoint and going to trusted endpoint
Jul 1 19:50:03.213 [SIP] (2) INVITE 1 B<C-Initial> add_p_early_media_header: add the header
Jul 1 19:50:03.213 [SIP] (2) INVITE 1 B<C-Initial> add_p_early_media_header: Use the default value
Jul 1 19:50:03.213 [SIP] (2) INVITE 1 B<C-Initial> set_p_early_media_header: support for P-Early-Media header
Jul 1 19:50:03.213 [SIP] (2) INVITE 1 B<C-Initial> set_p_early_media_header: elements in list: sendrecv
Jul 1 19:50:03.213 [SIP] (2) INVITE 1 B<C-Initial> set_p_early_media_header: adding to the header: sendrecv mode is 3
Jul 1 19:50:03.213 [SIP] (2) INVITE 1 B<C-Initial> set_p_early_media_header: add P-Early-Media header
Jul 1 19:50:03.213 [SIP] (2) header is sendrecv, supported

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