Arris TM902S -- would need a example SIP config

Hello,

We want to get the Arris TM902S eMTA get to work with SIP with the Firmware 7.10.145.EURO.SIP.
We are currently stuck at a strange point where the MTA sends SIP Register Messages where the Digest Username in the Authorization Body is correct but the SIP From and TO and Contact are filled with weird 4 digit numbers.
In our case 1251 for the first endpoint and 2252 for the second endpoint. (Interesting is that 251 is also the last octet of the MTA IP Address).

The output on the arris telnet session looks as follows:

---------------------
Console/emta/show cfg
---------------------
MTA config file name:

tftp://[222.222.222.222]/AUTO4cca102ef9fa51c03c4ad2abf5b89004

MTA config file contents:

.1.3.6.1.4.1.7432.1.1.1.6.0 1
.1.3.6.1.4.1.7432.2.1.1.21.0 1
.1.3.6.1.4.1.7432.1.1.1.6.0 1
.1.3.6.1.4.1.7432.2.1.1.15.0 24
.1.3.6.1.4.1.7432.2.1.1.16.0 40
.1.3.6.1.2.1.2.2.1.7.9 1
.1.3.6.1.2.1.2.2.1.7.10 1
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.4.1.1.9 222.222.222.222
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.4.1.2.9 5060
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.1.1.1.9 222.222.222.222
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.1.1.2.9 5060
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.3.1.1.9 445555555
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.3.1.4.9 445555555
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.3.1.3.9 our_password
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.3.1.2.9 0445555555
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.3.1.5.9 0[2-7]xxxxxxxx|09xxxxxxxx|08[0-5]xxxxxxx|08[7-9]xxxxxxx|0860xxxxxxxxx|086[1-9]xxxxxx|11[0-3]|116xxx|11[7-9]|114x|140|14[2-9]|141x|16[1-9]|160x|17x|18[0-6]x|187|18[8-9]x|19x|10[7-8]x+T|*x+T|#x+T|*xx*x+T|00x+T
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.4.1.1.10 222.222.222.222
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.4.1.2.10 5060
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.1.1.1.10 222.222.222.222
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.1.1.2.10 5060
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.3.1.1.10 445555556
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.3.1.4.10 445555556
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.3.1.3.10 our_password
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.3.1.2.10 0445555556
.1.3.6.1.4.1.4413.2.2.2.1.6.8.2.3.1.5.10 0[2-7]xxxxxxxx|09xxxxxxxx|08[0-5]xxxxxxx|08[7-9]xxxxxxx|0860xxxxxxxxx|086[1-9]xxxxxx|11[0-3]|116xxx|11[7-9]|114x|140|14[2-9]|141x|16[1-9]|160x|17x|18[0-6]x|187|18[8-9]x|19x|10[7-8]x+T|*x+T|#x+T|*xx*x+T|00x+T
.1.3.6.1.4.1.4491.2.2.1.1.2.7.0 1BD7187EDC5DC28D0DB2E6F13F731BB954F42EC7

did anybody have a similar situation?

thanks