Symptom
- No way audio when using secure hardware conference bridge.
- Issue is fixed after a reset for the HW CFB, but it comes back after few days.
Conditions
- Call flows:
1. Three internal IP phones create a conference with each other ---> no party can hear the other.
2. One internal IP phone with 2 external mobile phones create a conference with each other ---> only the internal phone is not able to hear.
CUCM is sending "Encryption Algorithm id 2 " to the gateway:
====================================
20602229.000 |11:40:49.693 |SdlSig |MXStartTalking |restart0 |UnicastBridgeControl(3,100,208,4) |AgenaInterface(3,100,11,21350) |3,100,247,325.2015^172.18.1.154^* |[R:N-H:0,N:1,L:0,V:0,Z:0,D:0] codec=2 aRate(msec)=20 confId=52884199 ipAddrType=0 ipv4=172.18.1.154 port=21844 silence=0 partyId=0x30059f8 callid=58116094 startTalkingFlag=T DiffServ=0xb8 (DSCP=0x2e) RFC2833 payload type=101 MediaEncryptionAlgorithm=2 PT=F PTId = 16777216 rfc_number=0x0 dyn payloadTypeNum=0 ILBCBRate=20ms ConnType=3 v150MER=F T38MER=F
Algorithm ID 0 detected by the gateway :
===============================
1w3d: OpenReceiveChannelMsg Info:
conference_id = 52884199, pass_through_party_id = 50354681
msec_pkt_size = 20, compression_type = 11
qualifier_in.ecvalue = 0, g723_bitrate = 0, call_ref = 58116095
stream_pass_through_id = 0, rfc2833_payload_type = 101
dtmf_method = 10
codec_dynamic_payload = 0, codec_mode = 0
SHA2 Encryption Info :: algorithm_id 0, key_len 0, salt_len 0
Workaround
1. Resetting the conference "No sccp , sccp" will solve the issue temprarily
2. Permnant fix when upgrading to the fixed version.
