If we want to have SRST on MGCP gateways, ensure that you have the two following commands:
!
service alternate
call-manager fallback-mgcp
!
This will ensure that the MGCP gateway can provide Call Processing with SRST. Don’t forget also to have an H323 config to take over in SRST as MGCP hasn’t any Call Control.
When a SIP Proxy Server forwards calls to Unity, it includes the following information:
- The called party extension included in the Diversion Header
- The reason why the call was forwarded in the Diversion Header
- The extension of the calling party (internal calls) or SIP URL of the calling party in the FROM header.
Cisco Unity provides voice mail and unified messaging capabilities for many thousands of users.
Unity can be integrated with the following products:
- Call Manager
- SIP
- Circuit-switched (traditional PBX)
- Circuit-switched via Intel PIMG
E&M stands for a lot of Acronym like
- Ear an Mouth
- Earth and Magneto
- Receive and Transmit
E&m uses an RJ48 interface and is often used to provide tie-line connectivity to PBX. there are 5 types of E&M Interfaces ( I, II , III , IV, V) which are all supported by Cisco except the Type IV.
On this line , we can find the following signaling :
- Wink-start
- delay -start
- immediate-start
- tone-start
Need to more explanations about the different modes !
FXS is an RJ11 interface which is connecting a phone, a fax,… In contrast with FXO, FXS provides dial tone and ring voltage.
FXS can use also the same signaling ( loop-start and ground-start) but loop-start signaling is preferred on FXS line.
FXO is an RJ11 interface which is providing a connection to a PSTN Central Office (CO) or to a PBX interface.
A FXO is considered as a telephony line. We can then find 2 types of signaling :
- Loop-start signaling : this is a type of supervisory signaling that allows indication of on-hook and off-hook states. But this signaling is vulnerable to a condition knows as glare that involves 2 endpoints seizing a trunk a the same time.
- Ground-start signaling : Same as loop-start signaling but this time we suppress the glare effect on these lines.
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