In a previous post i explained the concept of IP over E1 (IPoE1) , now i will try to clarify the difference in deploying IP over E1 and same implementation using the regular Ethernet in table below;

Item	IPoE1	IPoETH
Hardware	The UMG8900 requires both a TDM interface board (an E32 board for example) and an IOE board.	The UMG8900 requires an IP interface board (an E8T or G10 board for example).
Networking over Nb interface	UMG8900s are connected without routers.	UMG8900s are connected through routers.
Nb interface protocol stack	E1 is used at the physical layer and PPP is used at the link layer. In addition, cRTP is used to compress IP packets.	Twisted pair cables or optical fibers are used at the physical layer. TCP/IP is used at the data link layer.
Mc interface messages	The ADD_REQ message carries an extended EMP information element, which carries the IP domain information and IP bearer type.	No extended information element is used.
Nc interface messages	The IAM message carries an IP address and port number and uses the private codec 254 to indicate the IP bearer type (IP over E1).	No extended information element is used.
Codec	The data compression ratio in IP over E1 is high. The Adaptive Multi-Rate (AMR) codec uses the transparent mode and a single rate.	The AMR codec can be set to the support or transparent mode. Multiple rates are supported.
Configuration	On the UMG8900, TDM interfaces on the TDM interface board are bound with the internal interfaces on the IOE board, and IP addresses are configured for the internal interfaces. On the MGC, a non-zero IP domain is configured. The UMG8900s are not connected in full-mesh mode.	On the UMG8900, only an IP address needs to be configured for the IP interface board. By default, the MGC instructs the UMG8900 to use IP domain 0. The UMG8900s are connected in full-mesh mode.
Interaction with the MGC	IPoE1 does not support Call Mediation Node (CMN). Transcoder Free Operation (TrFO) must be enabled on the MGC.	IPoETH supports CMN. There is no need to enable TrFO on the MGC.

Note to use the IP over E1 solution, all the devices in the network must be Huawei devices. (proprietery solution required on the UMG).

Parameters involved in IP over E1

Parameter

Description

Bit 1 of P37 (VRP control parameter)

Controls whether user and transmission channel binding is enabled. 1 (by default): RTP packets are always transmitted over the bound channels. For an IP termination allocated to the VT interface, the RTP packet is transmitted through a serial interface bound to the VT interface. This parameter does not affect IP terminations allocated to serial interfaces that are not bound to the VT interface. 0: Each RTP packet is transmitted over a channel that is selected in turn among all the channels on the VT interface. For an IP termination (specified by a virtual TID) allocated to the VT interface, the RTP packet is transmitted through a serial interface bound to the VT interface. This parameter does not affect IP terminations allocated to serial interfaces that are not bound to the VT interface.

Thanks

useful document, thanks