How to set up a CISCO SG300 switch for Rostelecom?

Question

SIP

We use the services of Rostelecom, sip telephony and the Internet. From the provider, optics comes to us on the CISCO SG300 switch, from which five Sagemcom routers for telephony are wired and one port is connected to the Internet. For telephony, vlan2045 is used, for the Internet vlan2075 (found out in the support service). For the Internet, as I understand from phone support, we need to set up a link (ip, mask ...), pppoe, etc. is not used.
There was a need to reconfigure everything to the same new CISCO SG300. It is not possible to view the configs on a working one, so I will forgive help in setting it up.
I do the initial configuration on the switch:
Conf t
Hostname gz-access4
Vlan 100
Interface vlan 100
Ip address 10.44.1.4 255.255.255.0
On the switch on the port that I create 2 vlan from the operator:
Conf t
Vlan 2045
Vlan 2075
Int gi4
Switchport mode access
Switchport access vlan 2045
Switchport access vlan 2075
On the switch on ports that look towards Sagemcom for telephony:
Conf t
Int fe1-5
Switchport mode access
Switchport access vlan 2045
After I connect links to ports 1 to 5 - telephony is silent. What am I doing wrong?
Also, the question of setting up the Internet is not clear, what should be written in the config? I am attaching a photo. maps with the available data, maybe someone knows.

Answer 1

Port provider in a trunk switch.

Answer 2

Another nuance that Rostelecom has in the SIP protocol.
1. Rostelecom does not know about the existence of e.164. That is, the phone number should be broadcast in the format +7, not 8. Or without 8 and +7 at all, i.e. 10 digits.
2. Rostelecom does not accept authentication data in the form of email. Only in the form of a 10-digit telephone number.
3. The Contact field must be in 10-digit format. No URIs.
The second point may interfere with registration on the Rostelecom server. The first point is for outgoing calls. The third one is for incoming calls.
The fact is that for Rostelecom there is no concept of RFC. So they have their own standards, which you will have to adjust to.

Answer 3

What am I doing wrong?

You are served frames from two vlans, probably tagged, and you are trying to receive them with a port in access mode.
Try this (the syntax will probably need to be changed slightly):

Int gi4
switchport mode trunk
switchport trunk allowed vlan add 2045, 2075