How to prevent SIP calls that are on hold from releasing after five minutes
Symptom:
Dialogic® IMG Integrated Media Gateway calls, either SS7 <--> SIP or SIP <--> SIP calls, that have been placed on hold by SIP are released after five minutes.
Reason for the issue:
The IMG will release a SIP initiated on hold call after five minutes. In some cases, it may be desirable to leave the call on hold for longer or shorter periods. This timer is currently not configurable in Dialogic® ClientView (IMG 1010, IMG 1004) or the WebUI (IMG 2020) to prevent the release after five minutes.
Fix / Solution:
A raw API file can be created on a per channel group basis to lengthen or shorten the interval that a call may be on hold without releasing. Within the file, two timer values for both the incoming and outgoing channel groups need to be modified.
First, create a raw API file (plain text file) containing the following four lines. Bytes 13, 18, and 19 are place holders that must be replaced with the actual channel group and timer values, respectively:
00 11 00 cf 00 00 ff 00 01 37 02 00 IC 00 94 01 09 TT TT
00 11 00 cf 00 00 ff 00 01 37 02 00 IC 00 94 01 0a TT TT
00 11 00 cf 00 00 ff 00 01 37 02 00 OC 00 94 01 09 TT TT
00 11 00 cf 00 00 ff 00 01 37 02 00 OC 00 94 01 0a TT TT
To determine the hexadecimal values for the Channel Groups represented in byte 13, go to ClientView / WebUI and note the Channel Group ID for both the incoming and outgoing channel groups. For example, Channel Groups 0 and 7 would be hexadecimal values 0x20 and 0x27 - the GUI channel group ID plus 32 then converted to hex. Next, determine the timer value, which is represented in bytes 18 and 19. Each timer is a two byte hex value representing 10 ms. So, for example, to set the timers to release after 6 minutes, or 360 seconds, use 36,000, which is 0x8ca0.
The following example sets channel groups 0 and 7 to release an on-hold call after six minutes.
00 11 00 cf 00 00 ff 00 01 37 02 00 20 00 94 01 09 8c a0
00 11 00 cf 00 00 ff 00 01 37 02 00 20 00 94 01 0a 8c a0
00 11 00 cf 00 00 ff 00 01 37 02 00 27 00 94 01 09 8c a0
00 11 00 cf 00 00 ff 00 01 37 02 00 27 00 94 01 0a 8c a0
Limitations:
This fix only applies to calls between SS7 and SIP or SIP alone, where the SIP leg initiates the on-hold.
Related Documentation
Downloading a Raw File
MG 1010, IMG1004:
IMG 2020:
Product List:
Dialogic® IMG 1010 Integrated Media Gateway
Dialogic® IMG 1004 Integrated Media Gateway
Dialogic® IMG 2020 Integrated Media Gateway (IMG 2020), formerly referred to as Dialogic® BorderNet™ 2020 Session Border Controller
First published: 22-Dec-2009
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