Generate MTA configuration file from command line w/o packetace help ...

the docsis project at sourceforge "can" create mta config files though for a complete config file some custom coding may need to be done, depends on what options you want.

you can find it here http://docsis.sourceforge.net

As an example here is a decode of a working MTA config sanitized of course

docsis -d 000000000000.bin > 000000000000.cfg
Main
{
MtaConfigDelimiter 1;
VendorSpecific
{
VendorIdentifier 0x0000ca;
GenericTLV TlvCode 69 TlvStringZero "*[0-4]x|*50x.*x.[T#]|*5[356]x.[T#]|*5[47]|*6[1359]|*6[27]x.[T#]|*7[02]x.[T#]|*7[389]|*74xx*x.[T#]|*75xx|*80*x.*x.*x.[T#]|*82x.[T#]|*8[89]|*9[02689]x.[T#]|*93|"; /* tlv length = 159 */
}
VendorSpecific
{
VendorIdentifier 0x0000ca;
GenericTLV TlvCode 69 TlvStringZero "0[T#]|011x.[T#]|101x.[T#]|1411|[0-1][2-9]xxxxxxxxx|[2-9]11|[2-9]xxxxxx[T#]|[2-9]xxxxxxxxx"; /* tlv length = 90 */
}
SnmpMibObject pktcMtaDevEnabled.0 Integer 1; /* true */
SnmpMibObject enterprises.4115.11.1.27.0 String "5555555555" ;
SnmpMibObject enterprises.4115.11.1.28.0 String "5555555555" ;
SnmpMibObject enterprises.4115.10.1.3.0 IPAddress 10.10.10.10 ;
SnmpMibObject enterprises.4115.11.1.1.1.2.1 String "5551234567" ;
SnmpMibObject enterprises.4115.11.1.1.1.3.1 String "5551234567" ;
SnmpMibObject enterprises.4115.11.1.1.1.4.1 String "5551234567" ;
SnmpMibObject enterprises.4115.11.1.1.1.5.1 String "1234567890" ;
SnmpMibObject pktcNcsEndPntConfigMWD.9 Integer 2 ;
SnmpMibObject ifAdminStatus.9 Integer 1; /* up */
SnmpMibObject enterprises.4115.11.1.3.0 String "xxx.xxx.68.4;5060" ;
SnmpMibObject enterprises.4115.11.1.4.0 Integer 0 ;
SnmpMibObject enterprises.4115.11.1.5.0 String "xxx.xxx.68.4;5060" ;
SnmpMibObject enterprises.4115.11.1.6.0 Integer 0 ;
SnmpMibObject enterprises.4115.11.1.7.0 HexString 0x04808000 ;
SnmpMibObject enterprises.4115.11.1.8.0 String "PCMU;telephone-event" ;
SnmpMibObject enterprises.4115.11.1.9.0 Integer 20 ;
MtaConfigDelimiter 255;
}

You can encode this file with the command
docsis -p 000000000000.cfg 000000000000.bin

Now understanding what each line does in the file is the real trick...

Here is what I know
VendorSpecific stuff is digit map and feature enabling (this is what our SIP provider sets)

SnmpMibObject enterprises.4115.11.1.27.0 String "5555555555" ;
SnmpMibObject enterprises.4115.11.1.28.0 String "5555555555" ;
These lines combat a bug in old sip firmware that causes calls with no caller id to be dropped the value you set these to is not important as long as it is not a real telephone number.

SnmpMibObject enterprises.4115.10.1.3.0 IPAddress 10.10.10.10 ;
Syslog server address

SnmpMibObject enterprises.4115.11.1.1.1.2.1 String "5551234567" ;
SnmpMibObject enterprises.4115.11.1.1.1.3.1 String "5551234567" ;
SnmpMibObject enterprises.4115.11.1.1.1.4.1 String "5551234567" ;
SnmpMibObject enterprises.4115.11.1.1.1.5.1 String "1234567890" ;
These are username, displayname, login, and password respectfully

SnmpMibObject pktcNcsEndPntConfigMWD.9 Integer 2 ;
SnmpMibObject ifAdminStatus.9 Integer 1; /* up */
These turn the EMTA on and set its admin status to up.

SnmpMibObject enterprises.4115.11.1.3.0 String "xxx.xxx.68.4;5060" ;
SnmpMibObject enterprises.4115.11.1.4.0 Integer 0 ;
Proxy Address:port and type 0=ipv4

SnmpMibObject enterprises.4115.11.1.5.0 String "xxx.xxx.68.4;5060" ;
SnmpMibObject enterprises.4115.11.1.6.0 Integer 0 ;
Registrar Address:port and type 0=ipv4

SnmpMibObject enterprises.4115.11.1.7.0 HexString 0x04808000 ;
SIP Feature Switch options (our sip provider set this)

SnmpMibObject enterprises.4115.11.1.8.0 String "PCMU;telephone-event" ;
provisioned codecs

SnmpMibObject enterprises.4115.11.1.9.0 Integer 20 ;
packetization rate in millisecs