Contents

Introduction

Prerequisites

Requirements

Components Used

Background Information

Problem

Symptoms

Workaround

Introduction

This document describes the issue of Cisco Unified Border Elements/voice gateway dial peer status busyout and call failures after Cisco IOS® upgrade.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

The information in this document is based on Cisco Unified Border Elements (CUBE).

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.

Background Information

This document covers failures after Cisco IOS® upgrade to 16.12.6/17.3.5/17.6.1 or higher versions.

Problem

The calls are failing via Cisco IOS Voice Gateway or CUBE after Cisco IOS upgrade to 16.12.6/17.3.5/17.6.1/17.7.1 or higher versions.

Symptoms

When CUBE receives a SIP call, ad matches an outgoing dial-peer with session server-group and  sip options-keepalive configured, the call fails at the Call Control Application Programming Interface (CCAPI) layer with Cause Value 188.

The CUBE does not send out outbound INVITE to the destination servers that are part of the server group.

The incoming INVITE is responded to with TRYING and 503 Service Unavailable.

The same behavior is observed even when the dial-peer shows as busyout or active KEEPALIVE status under show dial-peer voice summary.

Sample configuration/dial-peer status/debug snippet:

dial-peer voice 1000 voip

destination-pattern ^1000$

session protocol sipv2

session transport tcp

session server-group 1

voice-class sip options-keepalive profile 1

voice-class sip bind control source-interface GigabitEthernet0/0/1

voice-class sip bind media source-interface GigabitEthernet0/0/1

dtmf-relay rtp-nte sip-kpml

codec g711ulaw

ip qos dscp cs3 signaling

no vad

voice class server-group 1

ipv4 10.106.117.11

ipv4 10.106.117.6 preference 1

show dial-peer voice summary

AD                                    PRE PASS SESS-SER-GRP  OUT

TAG    TYPE  MIN  OPER PREFIX    DEST-PATTERN      FER THRU SESS-TARGET    STAT PORT    KEEPALIVE    VRF

3001   voip  up   up                                0  syst                                             NA

1000   voip  up   up             ^1000$             0  syst SESS-SVR-GRP: 1               busyout    NA

show dial-peer voice summary

AD                                    PRE PASS SESS-SER-GRP  OUT

TAG    TYPE  MIN  OPER PREFIX    DEST-PATTERN      FER THRU SESS-TARGET    STAT PORT    KEEPALIVE    VRF

3001   voip  up   up                                0  syst                                                NA

1000   voip  up   up             ^1000$             0  syst SESS-SVR-GRP: 1               active     NA

Debug snippet:

007592: Apr  7 07:28:56.046: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:

Received:

INVITE sip:1000@10.106.117.5:5060 SIP/2.0

Via: SIP/2.0/UDP 10.106.117.2:5060;branch=z9hG4bK51889

Remote-Party-ID: <sip:3001@10.106.117.2>;party=calling;screen=no;privacy=off

From: <sip:3001@10.106.117.2>;tag=12EE76F8-154A

To: <sip:1000@10.106.117.5>

Date: Wed, 06 Apr 2022 18:28:16 GMT

Call-ID: 28E9846D-B50E11EC-8025D5B1-C2D1F237@10.106.117.2

Supported: 100rel,timer,resource-priority,replaces,sdp-anat

Min-SE:  1800

Cisco-Guid: 0678152134-3037598188-2149635505-3268538935

User-Agent: Cisco-SIPGateway/IOS-12.x

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

CSeq: 101 INVITE

Max-Forwards: 70

Timestamp: 1649269696

Contact: <sip:3001@10.106.117.2:5060>

Expires: 180

Allow-Events: telephone-event

Content-Type: application/sdp

Content-Disposition: session;handling=required

Content-Length: 247

v=0

o=CiscoSystemsSIP-GW-UserAgent 8965 7288 IN IP4 10.106.117.2

s=SIP Call

c=IN IP4 10.106.117.2

t=0 0

m=audio 18406 RTP/AVP 0 101

c=IN IP4 10.106.117.2

a=rtpmap:0 PCMU/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-16

a=ptime:20

007649: Apr  7 07:28:56.050://-1/286BC7C68020/SIP/Info/info/2048/sipSPIGetCallConfig: Peer tag 3001 matched for incoming call

007872: Apr  7 07:28:56.061: //89/286BC7C68020/CCAPI/ccCallSetupRequest:

Destination=, Calling IE Present=TRUE, Mode=0,

Outgoing Dial-peer=1000, Params=0x7FF65E441DE8, Progress Indication=NULL(0)

007935: Apr  7 07:28:56.064: //-1/xxxxxxxxxxxx/SIP/Info/critical/8192/ccsip_call_setup_request: SIP Dialpeer 1000 busied out due to options-keepalive profile in server group

008160: Apr  7 07:28:56.073: //90/286BC7C68020/CCAPI/cc_api_call_disconnected:

Cause Value=188, Interface=0x7FF64F4542E8, Call Id=90

008199: Apr  7 07:28:56.077: //89/286BC7C68020/CCAPI/ccCallDisconnect:

Cause Value=188, Tag=0x0, Call Entry(Previous Disconnect Cause=0, Disconnect Cause=0)

008239: Apr  7 07:28:56.079: //89/286BC7C68020/SIP/Msg/ccsipDisplayMsg:

Sent:

SIP/2.0 503 Service Unavailable

Via: SIP/2.0/UDP 10.106.117.2:5060;branch=z9hG4bK51889

From: <sip:3001@10.106.117.2>;tag=12EE76F8-154A

To: <sip:1000@10.106.117.5>;tag=1C2F76-17F5

Date: Wed, 06 Apr 2022 17:28:56 GMT

Call-ID: 28E9846D-B50E11EC-8025D5B1-C2D1F237@10.106.117.2

Timestamp: 1649269696

CSeq: 101 INVITE

Allow-Events: telephone-event

Server: Cisco-SIPGateway/IOS-17.3.5

Reason: Q.850;cause=0

Session-ID: 00000000000000000000000000000000;remote=3c1f754eba075201a684fda2c51c04df

Content-Length: 0

Workaround

1. Configure the outgoing dial-peer with session target ip4 instead of session server-group. If needed, create a separate dial-peer for each IP of the server group.

dial-peer voice 1000 voip

session target ipv4:x.x.x.x

dial-peer voice 1001 voip

session target ipv4:x.x.x.x

2. Remove the sip options-keepalive on the dial-peer.

dial-peer voice 1000 voip

no voice-class sip options-keepalive profile 1

3. Downgrade to an earlier version. This issue was introduced after the commitment of Cisco bug ID CSCvx92872.

This issue is documented on Cisco bug ID CSCvz80171.

Fix is available from 16.12.8/17.3.6/17.6.3/17.7.1/17.8.1